BUG: need to mask out aggregated levels
BUG: need to mask out aggregated levels

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