ENH: perf_HEAD cleanups and enhancements
ENH: perf_HEAD cleanups and enhancements

- add functions to collect and prepre results from travis
- add more metadata to json blob: hostname, utc datetime, number of jobs on host
- exit with error exit code if exceptions were caught (make travis job fail)
- change gist results file extension to .json

GuessWhoSamFoo/pandas,jreback/pandas,harisbal/pandas,amolkahat/pandas,linebp/pandas,jorisvandenbossche/pandas,gfyoung/pandas,nmartensen/pandas,harisbal/pandas,linebp/pandas,GuessWhoSamFoo/pandas,datapythonista/pandas,toobaz/pandas,MJuddBooth/pandas,nmartensen/pandas,datapythonista/pandas,jreback/pandas,Winand/pandas,Winand/pandas,cython-testbed/pandas,jmmease/pandas,jorisvandenbossche/pandas,zfrenchee/pandas,MJuddBooth/pandas,kdebrab/pandas,jmmease/pandas,DGrady/pandas,cbertinato/pandas,Winand/pandas,toobaz/pandas,zfrenchee/pandas,cython-testbed/pandas,cython-testbed/pandas,amolkahat/pandas,jorisvandenbossche/pandas,cbertinato/pandas,rs2/pandas,jreback/pandas,amolkahat/pandas,DGrady/pandas,harisbal/pandas,DGrady/pandas,pratapvardhan/pandas,linebp/pandas,nmartensen/pandas,rs2/pandas,gfyoung/pandas,winklerand/pandas,MJuddBooth/pandas,linebp/pandas,linebp/pandas,kdebrab/pandas,harisbal/pandas,cbertinato/pandas,jorisvandenbossche/pandas,dsm054/pandas,pratapvardhan/pandas,cbertinato/pandas,jmmease/pandas,louispotok/pandas,cython-testbed/pandas,winklerand/pandas,MJuddBooth/pandas,zfrenchee/pandas,dsm054/pandas,dsm054/pandas,winklerand/pandas,nmartensen/pandas,harisbal/pandas,pandas-dev/pandas,nmartensen/pandas,louispotok/pandas,kdebrab/pandas,TomAugspurger/pandas,cython-testbed/pandas,pratapvardhan/pandas,dsm054/pandas,linebp/pandas,pandas-dev/pandas,gfyoung/pandas,jmmease/pandas,jreback/pandas,gfyoung/pandas,DGrady/pandas,MJuddBooth/pandas,dsm054/pandas,cbertinato/pandas,rs2/pandas,jmmease/pandas,winklerand/pandas,kdebrab/pandas,GuessWhoSamFoo/pandas,TomAugspurger/pandas,winklerand/pandas,TomAugspurger/pandas,louispotok/pandas,toobaz/pandas,Winand/pandas,toobaz/pandas,nmartensen/pandas,toobaz/pandas,pratapvardhan/pandas,TomAugspurger/pandas,jmmease/pandas,gfyoung/pandas,datapythonista/pandas,louispotok/pandas,pratapvardhan/pandas,GuessWhoSamFoo/pandas,pandas-dev/pandas,jreback/pandas,datapythonista/pandas,Winand/pandas,Winand/pandas,pandas-dev/pandas,amolkahat/pandas,rs2/pandas,kdebrab/pandas,DGrady/pandas,GuessWhoSamFoo/pandas,DGrady/pandas,winklerand/pandas,amolkahat/pandas,zfrenchee/pandas,zfrenchee/pandas,louispotok/pandas