added stored procedure to remove archived bit check from search, added migration
added call to new stored procedure for calendar search to php course model
added calendar-specific function for searching courses by title to php course model
updated query functions and calls to differentiate between calendar and non-calendar searches
drop and create procedure in two statements, renamed object to match filename
Merge pull request #706 from thecoolestguy/576_course_filing_removal_bug

576 course filing removal bug
re-pointed learner function calls to the learner functions and not the instructor-related ones
Merge pull request #707 from thecoolestguy/636_learner_group_filter_on_calendar_bugfix

re-pointed learner function calls to the learner functions and not the instructor ones
changed date strings to reflect longer calendar period
Merge pull request #709 from thecoolestguy/708_extend_calendar_feed_time_period

changed date strings to reflect longer calendar period