ENH: Allow read_frame to use parameterized queries
ENH: Allow read_frame to use parameterized queries

Added params argument to read_frame that is passed directly to the
execute method.  This allows users to use a parameterized query
rather than having to pre-format the SQL themselves.

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