Add some information in readme
Add some information in readme

* Information about the stack and buildpack on heroku create command
* Information about the compiling of asset when you upgrade

see #543

griff/errbit,12spokes/errbit,mvz/errbit,Promptus/errbit,errbit/errbit,PeggApp/pegg-errors,arrowcircle/errbit,Gratzi/pegg-errors,mvz/errbit,ZeusWPI/errbit,huangxiangdan/errbit,micred/errbit,bengler/errbit,ninech/errbit,accessd/errbit,fxposter/errbit,errbit/errbit,ndlib/errbit,assetricity/errbit,fusco/errbit,rightscale/errbit,14113/errbit-1,jaronkk/errbit,damau/errbit,fireho/errbit,otzy007/errbit,Undev/errbit,denyago/errbit,joshuaswilcox/Errbitstrap,stevecrozz/errbit,sideci-sample/sideci-sample-errbit,appdate/errbit,Undev/errbit,burningpony/errbit,mikk150/errbit,fusco/errbit,peertransfer/errbit,alphagov/errbit,arrowcircle/errbit,lucianosousa/errbit,Promptus/errbit,CarlosCD/errbit,accessd/errbit,Stackato-Apps/errbit,openSUSE/errbit,pandora2000/errbit,shyftplan/errbit,mak-it/errbit,rightscale/errbit_old,12spokes/errbit,disvelop/errbit,concordia-publishing-house/errbit,salemove/errbit,denyago/errbit,sideci-sample/sideci-sample-errbit,pandora2000/errbit,CarlosCD/errbit,peertransfer/errbit,rud/errbit,concordia-publishing-house/errbit,jaronkk/errbit,gravity-platform/errbit,appdate/errbit,ninech/errbit,accessd/errbit,assetricity/errbit,3zcurdia/errbit,francetv/errbit,notch8/errbit,linki/errbit,Talentee/errbit,mikk150/errbit,alphagov/errbit,Gratzi/pegg-errors,projectdx/errbit,Cloud-Temple/errbit,rightscale/errbit_old,ninech/errbit,denyago/errbit,alphagov/errbit,otzy007/errbit,notch8/errbit,12spokes/errbit,salemove/errbit,wombatsecurity/errbit,huangxiangdan/errbit,fireho/errbit,3zcurdia/errbit,projectdx/errbit,appdate/errbit,mvz/errbit,jordoh/errbit,francetv/errbit,iFixit/errbit,deskrock/errbit,jordoh/errbit,disvelop/errbit,subvisual/errbit,shivanibhanwal/errbit,chautoni/mingle-errbit,cognoa/errbit,projectdx/errbit,PeggApp/pegg-errors,lucianosousa/errbit,dwilkie/errbit,subvisual/errbit,bengler/errbit,Undev/errbit,diowa/errbit,cognoa/errbit,alphagov/errbit,peertransfer/errbit,PeggApp/pegg-errors,rightscale/errbit_old,Cloud-Temple/errbit,felixbuenemann/errbit,startdatelabs/errbit,14113/errbit-1,denyago/errbit,subvisual/errbit,cognoa/errbit,fireho/errbit,steveyken/errbit,rud/errbit,bonanza-market/errbit,startdatelabs/errbit,wombatsecurity/errbit,steveyken/errbit,Undev/errbit,pandora2000/errbit,cph/errbit,deskrock/errbit,rud/errbit,ndlib/errbit,vinco/errbit,deskrock/errbit,CarlosCD/errbit,jjosten/errbit,joshuaswilcox/Errbitstrap,Strnadj/errbit,threatsim/errbit,Strnadj/errbit,shyftplan/errbit,jjosten/errbit,openSUSE/errbit,micred/errbit,griff/errbit,notch8/errbit,griff/errbit,mak-it/errbit,shyftplan/errbit,steveyken/errbit,felixbuenemann/errbit,linki/errbit,stevecrozz/errbit,wombatsecurity/errbit,openSUSE/errbit,bonanza-market/errbit,14113/errbit-1,burningpony/errbit,micred/errbit,rightscale/errbit_old,14113/errbit-1,aurels/errbit,startdatelabs/errbit,lucianosousa/errbit,sinrutina/errbit,mikk150/errbit,gravity-platform/errbit,gravity-platform/errbit,jaronkk/errbit,Talentee/errbit,shivanibhanwal/errbit,deskrock/errbit,espnbr/errbit,otzy007/errbit,bonanza-market/errbit,arrowcircle/errbit,Stackato-Apps/errbit,vinco/errbit,jjosten/errbit,arrowcircle/errbit,cph/errbit,salemove/errbit,threatsim/errbit,aurels/errbit,fxposter/errbit,espnbr/errbit,shivanibhanwal/errbit,huangxiangdan/errbit,stevecrozz/errbit,ZeusWPI/errbit,jordoh/errbit,threatsim/errbit,KomalDhanwani/errorinspector,joshuaswilcox/Errbitstrap,damau/errbit,wombatsecurity/errbit,francetv/errbit,3zcurdia/errbit,assetricity/errbit,espnbr/errbit,dwilkie/errbit,diowa/errbit,fxposter/errbit,linki/errbit,sinrutina/errbit,accessd/errbit,cph/errbit,mak-it/errbit,KomalDhanwani/errorinspector,burningpony/errbit,pallan/errbit,concordia-publishing-house/errbit,subvisual/errbit,iFixit/errbit,concordia-publishing-house/errbit,diowa/errbit,Stackato-Apps/errbit,damau/errbit,chautoni/mingle-errbit,ZeusWPI/errbit,bengler/errbit,KomalDhanwani/errorinspector,cph/errbit,sinrutina/errbit,Strnadj/errbit,Talentee/errbit,Cloud-Temple/errbit,fusco/errbit,iFixit/errbit,chautoni/mingle-errbit,ndlib/errbit,pallan/errbit,Gratzi/pegg-errors,dwilkie/errbit,threatsim/errbit,Promptus/errbit,vinco/errbit,rightscale/errbit,disvelop/errbit,rightscale/errbit,Talentee/errbit,errbit/errbit,felixbuenemann/errbit