Data totals are incorrect - data for the starting month is (possibly) ignored

So running a custom query based on user creation dates... the two dates I selected were:
03/17/2011 (from) and 07/31/2012 (to)

The users who were created from 03/17/2011 to 03/31/2011 were not included in the chart where it says (Total: XXX) because the value for $steps in the function _quant_build_date_array() was 16.67 which means when you're backtracking to create the $dates array, the first month that will be included in the rendered chart is April, not March, and so users created in March will not be included in either the chart or the totals.

So, no reason to not add another month. The data pulled from the query will still be the same. Quickest fix was to add 1 to the $steps. See the patch, lemme know what you think.