Add some additional excel reading/writing tests
Add some additional excel reading/writing tests

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