Add edit commit functionality to InstantAnswer.pm

This is functional but I need to do a little more testing.  

Adds functions to IA.pm to commit edits from the updates column.  Eventually these can be use by a new edit page instead of a separate script. 
- commit_edit: commits a single edit from the updates column
- remove_edit: removes an edit from the updates column 
- get_edits: returns an array of the data in the updates column