SQL: read_sql with a stored procedure 
pandas 0.14.0

pandas.io.sql.read_sql(sql,dbconn) does not work if the string sql does not have 'select' in it. If I'm reading a sproc, sql will start with 'exec' and no 'select'.

There is a test on line 377 in pandas\io\sql.py
if 'select' in sql.lower()

I modified it to 
if 'select' in sql.lower() or 'exec' in sql.lower()

then it works.
