Ensure that we can get a commit number from git
Ensure that we can get a commit number from git

Currently, git describe fails with "fatal: No names found, cannot describe anything."
MJuddBooth/pandas,nmartensen/pandas,pratapvardhan/pandas,amolkahat/pandas,cython-testbed/pandas,winklerand/pandas,cbertinato/pandas,cython-testbed/pandas,linebp/pandas,MJuddBooth/pandas,jorisvandenbossche/pandas,jreback/pandas,jmmease/pandas,GuessWhoSamFoo/pandas,linebp/pandas,gfyoung/pandas,Winand/pandas,amolkahat/pandas,MJuddBooth/pandas,dsm054/pandas,zfrenchee/pandas,louispotok/pandas,Winand/pandas,harisbal/pandas,nmartensen/pandas,DGrady/pandas,gfyoung/pandas,kdebrab/pandas,toobaz/pandas,cbertinato/pandas,zfrenchee/pandas,winklerand/pandas,kdebrab/pandas,winklerand/pandas,winklerand/pandas,rs2/pandas,rs2/pandas,DGrady/pandas,pratapvardhan/pandas,kdebrab/pandas,linebp/pandas,harisbal/pandas,jorisvandenbossche/pandas,toobaz/pandas,nmartensen/pandas,datapythonista/pandas,Winand/pandas,cbertinato/pandas,zfrenchee/pandas,dsm054/pandas,DGrady/pandas,jorisvandenbossche/pandas,pandas-dev/pandas,gfyoung/pandas,jmmease/pandas,amolkahat/pandas,linebp/pandas,louispotok/pandas,nmartensen/pandas,datapythonista/pandas,pandas-dev/pandas,datapythonista/pandas,rs2/pandas,gfyoung/pandas,nmartensen/pandas,jmmease/pandas,jreback/pandas,jreback/pandas,TomAugspurger/pandas,kdebrab/pandas,GuessWhoSamFoo/pandas,dsm054/pandas,MJuddBooth/pandas,dsm054/pandas,dsm054/pandas,datapythonista/pandas,louispotok/pandas,TomAugspurger/pandas,toobaz/pandas,toobaz/pandas,Winand/pandas,louispotok/pandas,linebp/pandas,zfrenchee/pandas,GuessWhoSamFoo/pandas,amolkahat/pandas,pratapvardhan/pandas,jmmease/pandas,cython-testbed/pandas,louispotok/pandas,TomAugspurger/pandas,Winand/pandas,jreback/pandas,pratapvardhan/pandas,winklerand/pandas,cbertinato/pandas,linebp/pandas,jorisvandenbossche/pandas,harisbal/pandas,jmmease/pandas,harisbal/pandas,toobaz/pandas,jreback/pandas,Winand/pandas,rs2/pandas,pandas-dev/pandas,winklerand/pandas,DGrady/pandas,pratapvardhan/pandas,jmmease/pandas,MJuddBooth/pandas,nmartensen/pandas,cython-testbed/pandas,cbertinato/pandas,GuessWhoSamFoo/pandas,zfrenchee/pandas,kdebrab/pandas,GuessWhoSamFoo/pandas,pandas-dev/pandas,cython-testbed/pandas,DGrady/pandas,gfyoung/pandas,DGrady/pandas,TomAugspurger/pandas,amolkahat/pandas,harisbal/pandas