row labels use underscore rather than dash: 1_2 rather than 1-2 in DataFrames
change DataFrame row labels to use underscore rather than dash, and test for empty table query results
convert dates to datetime objects in table.cast_row
fix for unnecessary pandas import errors SYNPY-177
fixes to _getUserbyPrincipalIdOrName and setPermissions
improvements based on code review
Merge pull request #197 from cbare/develop

Tables edge cases