tools/pyboard.py: Add "--follow" option to wait for output indefinitely.
tools/pyboard.py: Add "--follow" option to wait for output indefinitely.

Also flush stdout so you can see output as it comes.

ruffy91/micropython,misterdanb/micropython,warner83/micropython,suda/micropython,feilongfl/micropython,mpalomer/micropython,xyb/micropython,kostyll/micropython,rubencabrera/micropython,jimkmc/micropython,tobbad/micropython,HenrikSolver/micropython,pozetroninc/micropython,torwag/micropython,dinau/micropython,PappaPeppar/micropython,jmarcelino/pycom-micropython,swegener/micropython,micropython/micropython-esp32,orionrobots/micropython,lbattraw/micropython,tobbad/micropython,tobbad/micropython,hosaka/micropython,alex-march/micropython,slzatz/micropython,noahwilliamsson/micropython,utopiaprince/micropython,firstval/micropython,trezor/micropython,misterdanb/micropython,PappaPeppar/micropython,ganshun666/micropython,misterdanb/micropython,suda/micropython,swegener/micropython,MrSurly/micropython-esp32,tralamazza/micropython,adamkh/micropython,mhoffma/micropython,jimkmc/micropython,blmorris/micropython,orionrobots/micropython,chrisdearman/micropython,stonegithubs/micropython,ahotam/micropython,xhat/micropython,noahchense/micropython,lbattraw/micropython,heisewangluo/micropython,cloudformdesign/micropython,Peetz0r/micropython-esp32,ericsnowcurrently/micropython,vitiral/micropython,tuc-osg/micropython,neilh10/micropython,mgyenik/micropython,dinau/micropython,stonegithubs/micropython,vitiral/micropython,tuc-osg/micropython,SHA2017-badge/micropython-esp32,noahchense/micropython,mpalomer/micropython,ernesto-g/micropython,bvernoux/micropython,EcmaXp/micropython,swegener/micropython,galenhz/micropython,feilongfl/micropython,emfcamp/micropython,redbear/micropython,danicampora/micropython,omtinez/micropython,ryannathans/micropython,adamkh/micropython,vitiral/micropython,bvernoux/micropython,cloudformdesign/micropython,pramasoul/micropython,ernesto-g/micropython,Peetz0r/micropython-esp32,orionrobots/micropython,hosaka/micropython,Timmenem/micropython,selste/micropython,lowRISC/micropython,mhoffma/micropython,heisewangluo/micropython,pfalcon/micropython,tdautc19841202/micropython,neilh10/micropython,orionrobots/micropython,firstval/micropython,SHA2017-badge/micropython-esp32,adafruit/circuitpython,TDAbboud/micropython,adafruit/micropython,AriZuu/micropython,galenhz/micropython,matthewelse/micropython,hosaka/micropython,adafruit/circuitpython,Timmenem/micropython,chrisdearman/micropython,SHA2017-badge/micropython-esp32,pramasoul/micropython,drrk/micropython,mgyenik/micropython,blmorris/micropython,AriZuu/micropython,utopiaprince/micropython,selste/micropython,puuu/micropython,dinau/micropython,bvernoux/micropython,infinnovation/micropython,suda/micropython,suda/micropython,ganshun666/micropython,dhylands/micropython,rubencabrera/micropython,alex-march/micropython,ruffy91/micropython,tobbad/micropython,selste/micropython,mianos/micropython,hiway/micropython,alex-march/micropython,toolmacher/micropython,adamkh/micropython,ahotam/micropython,henriknelson/micropython,MrSurly/micropython,xyb/micropython,deshipu/micropython,pozetroninc/micropython,pramasoul/micropython,TDAbboud/micropython,lowRISC/micropython,warner83/micropython,slzatz/micropython,SHA2017-badge/micropython-esp32,adafruit/circuitpython,toolmacher/micropython,dinau/micropython,hiway/micropython,alex-robbins/micropython,jmarcelino/pycom-micropython,jlillest/micropython,heisewangluo/micropython,pramasoul/micropython,slzatz/micropython,adamkh/micropython,tobbad/micropython,infinnovation/micropython,martinribelotta/micropython,ahotam/micropython,ceramos/micropython,kerneltask/micropython,kerneltask/micropython,infinnovation/micropython,jimkmc/micropython,dmazzella/micropython,ChuckM/micropython,xyb/micropython,rubencabrera/micropython,mianos/micropython,micropython/micropython-esp32,dxxb/micropython,trezor/micropython,ernesto-g/micropython,xhat/micropython,lbattraw/micropython,dmazzella/micropython,MrSurly/micropython-esp32,dhylands/micropython,mpalomer/micropython,matthewelse/micropython,turbinenreiter/micropython,dhylands/micropython,stonegithubs/micropython,supergis/micropython,adafruit/circuitpython,MrSurly/micropython,kerneltask/micropython,Timmenem/micropython,skybird6672/micropython,ceramos/micropython,kostyll/micropython,micropython/micropython-esp32,alex-march/micropython,trezor/micropython,AriZuu/micropython,ericsnowcurrently/micropython,praemdonck/micropython,dxxb/micropython,ceramos/micropython,pozetroninc/micropython,lowRISC/micropython,ruffy91/micropython,pfalcon/micropython,galenhz/micropython,noahwilliamsson/micropython,omtinez/micropython,MrSurly/micropython-esp32,cnoviello/micropython,tdautc19841202/micropython,adafruit/micropython,emfcamp/micropython,PappaPeppar/micropython,lbattraw/micropython,jmarcelino/pycom-micropython,torwag/micropython,blazewicz/micropython,drrk/micropython,dxxb/micropython,misterdanb/micropython,galenhz/micropython,feilongfl/micropython,vitiral/micropython,redbear/micropython,swegener/micropython,TDAbboud/micropython,kerneltask/micropython,cnoviello/micropython,ChuckM/micropython,HenrikSolver/micropython,cwyark/micropython,ericsnowcurrently/micropython,drrk/micropython,martinribelotta/micropython,alex-robbins/micropython,danicampora/micropython,ceramos/micropython,lowRISC/micropython,MrSurly/micropython-esp32,ericsnowcurrently/micropython,xhat/micropython,bvernoux/micropython,mhoffma/micropython,blazewicz/micropython,blazewicz/micropython,trezor/micropython,toolmacher/micropython,xuxiaoxin/micropython,PappaPeppar/micropython,lbattraw/micropython,noahchense/micropython,pozetroninc/micropython,ryannathans/micropython,noahchense/micropython,ryannathans/micropython,mhoffma/micropython,slzatz/micropython,kostyll/micropython,jimkmc/micropython,slzatz/micropython,xuxiaoxin/micropython,xuxiaoxin/micropython,feilongfl/micropython,xhat/micropython,hiway/micropython,ganshun666/micropython,oopy/micropython,pfalcon/micropython,Timmenem/micropython,AriZuu/micropython,emfcamp/micropython,deshipu/micropython,kostyll/micropython,praemdonck/micropython,xuxiaoxin/micropython,heisewangluo/micropython,tralamazza/micropython,utopiaprince/micropython,Timmenem/micropython,puuu/micropython,mgyenik/micropython,praemdonck/micropython,turbinenreiter/micropython,alex-march/micropython,alex-robbins/micropython,orionrobots/micropython,blazewicz/micropython,MrSurly/micropython,ryannathans/micropython,torwag/micropython,emfcamp/micropython,chrisdearman/micropython,neilh10/micropython,vriera/micropython,pramasoul/micropython,xuxiaoxin/micropython,blazewicz/micropython,vriera/micropython,adafruit/micropython,mgyenik/micropython,jlillest/micropython,swegener/micropython,pfalcon/micropython,PappaPeppar/micropython,puuu/micropython,toolmacher/micropython,EcmaXp/micropython,tuc-osg/micropython,emfcamp/micropython,ceramos/micropython,skybird6672/micropython,tdautc19841202/micropython,dmazzella/micropython,warner83/micropython,vriera/micropython,ChuckM/micropython,torwag/micropython,omtinez/micropython,tdautc19841202/micropython,SHA2017-badge/micropython-esp32,cloudformdesign/micropython,dxxb/micropython,drrk/micropython,TDAbboud/micropython,cloudformdesign/micropython,HenrikSolver/micropython,hiway/micropython,ruffy91/micropython,ChuckM/micropython,kostyll/micropython,feilongfl/micropython,redbear/micropython,neilh10/micropython,firstval/micropython,matthewelse/micropython,jlillest/micropython,danicampora/micropython,redbear/micropython,micropython/micropython-esp32,selste/micropython,firstval/micropython,MrSurly/micropython,MrSurly/micropython,Peetz0r/micropython-esp32,lowRISC/micropython,micropython/micropython-esp32,puuu/micropython,jmarcelino/pycom-micropython,chrisdearman/micropython,trezor/micropython,alex-robbins/micropython,tdautc19841202/micropython,alex-robbins/micropython,infinnovation/micropython,mianos/micropython,bvernoux/micropython,adafruit/circuitpython,omtinez/micropython,danicampora/micropython,supergis/micropython,jlillest/micropython,skybird6672/micropython,matthewelse/micropython,deshipu/micropython,selste/micropython,mianos/micropython,stonegithubs/micropython,toolmacher/micropython,suda/micropython,firstval/micropython,matthewelse/micropython,adafruit/micropython,matthewelse/micropython,turbinenreiter/micropython,MrSurly/micropython-esp32,mpalomer/micropython,henriknelson/micropython,blmorris/micropython,oopy/micropython,dmazzella/micropython,chrisdearman/micropython,henriknelson/micropython,martinribelotta/micropython,hiway/micropython,blmorris/micropython,ruffy91/micropython,vriera/micropython,hosaka/micropython,oopy/micropython,vriera/micropython,tralamazza/micropython,ernesto-g/micropython,xhat/micropython,noahwilliamsson/micropython,xyb/micropython,noahwilliamsson/micropython,cwyark/micropython,EcmaXp/micropython,supergis/micropython,mpalomer/micropython,praemdonck/micropython,cwyark/micropython,warner83/micropython,tuc-osg/micropython,jimkmc/micropython,hosaka/micropython,ahotam/micropython,AriZuu/micropython,jlillest/micropython,dhylands/micropython,martinribelotta/micropython,dhylands/micropython,mianos/micropython,pfalcon/micropython,EcmaXp/micropython,noahchense/micropython,cnoviello/micropython,misterdanb/micropython,praemdonck/micropython,ryannathans/micropython,mgyenik/micropython,deshipu/micropython,adamkh/micropython,ernesto-g/micropython,henriknelson/micropython,tralamazza/micropython,turbinenreiter/micropython,supergis/micropython,adafruit/circuitpython,kerneltask/micropython,danicampora/micropython,utopiaprince/micropython,HenrikSolver/micropython,blmorris/micropython,mhoffma/micropython,cnoviello/micropython,Peetz0r/micropython-esp32,ericsnowcurrently/micropython,oopy/micropython,dinau/micropython,vitiral/micropython,Peetz0r/micropython-esp32,drrk/micropython,xyb/micropython,ChuckM/micropython,TDAbboud/micropython,skybird6672/micropython,omtinez/micropython,infinnovation/micropython,heisewangluo/micropython,redbear/micropython,torwag/micropython,oopy/micropython,dxxb/micropython,jmarcelino/pycom-micropython,adafruit/micropython,cloudformdesign/micropython,pozetroninc/micropython,HenrikSolver/micropython,cwyark/micropython,rubencabrera/micropython,warner83/micropython,stonegithubs/micropython,supergis/micropython,cnoviello/micropython,utopiaprince/micropython,noahwilliamsson/micropython,puuu/micropython,deshipu/micropython,neilh10/micropython,cwyark/micropython,ahotam/micropython,EcmaXp/micropython,galenhz/micropython,henriknelson/micropython,ganshun666/micropython,martinribelotta/micropython,skybird6672/micropython,ganshun666/micropython,rubencabrera/micropython,tuc-osg/micropython,turbinenreiter/micropython