Created actions directive for row button generation/significantly more DRY
Moved directives into dedicated folder & split into one file per directive (ftss-directives.js was getting unmanageable).
Added better error handling for Student requirements builder
Standardized tables hg-repeat to row in group, added ng-dblclick to support dblclick editing of rows & implemented new actions directive
Moved SVG header to FTSS.icons._svg due to directives refactoring
Quick comment for drag over event listener
More cleanup of selectize open/close CSS