Add .gitignore
Add ajax request to return location array based on room #
Update get_loc.php

-Loads location buttons when a room button is clicked
-Loading indicator displayed until ajax request completed
Remove unnecessary datalists from #add form

-After rooms and locations selected, display: none
-Insert location value when corresponding button is clicked
Create general callback function for ajax requests

-Add simple error reporting in get_loc.php
Merge remote-tracking branch 'origin/master'