more tidy ups from phpstorm
CRM-14743 add support for api operators to BAO query object (although at the end will be
over-ruled by various other handlings, however, we are locking in by test
CRM-14743 add ability to api-range-query modified date
comment fix
CRM-14743 additional test
Merge pull request #3357 from eileenmcnaughton/CRM-14743

CRM-14743 add support for api operators to modified_date & created_date