fix stacked-column to actually show average instead of just first response
try/except isn't need, moved annotate up
adds grid standard deviation endpoint
fix pep8 failure
catch last place I missed for select_params
add total to grid-standard-deviation
add market to grid-standard-deviation filter

fixes #205
add multi-select support to crosstab
Merge pull request #338 from wraithan/grid-standard-deviation

adds grid standard deviation endpoint