bb_plot_ca has some date issues

The database changed date formats and am trying to update the bb and pim
functions.
Revert "bb_plot_ca has some date issues"

This reverts commit cfc30ad8fa1dc8fbbc7b3edb23c87be81bee04c0.
Date issue

please check that lines 145 to 150 in bb_tools.R are ok. The input date
format is now YYYY/MM/DD
Added pim_parse and pim_sum

have also bumped the version up
Merge pull request #5 from GBrownstein/master

OK. Will merge and check.