UI changes

Fixed bugs:
Unable to split immediately after merging cells
Deselect previously selected areas on click
Multiple layers of squares added upon pressing m repeatedly

Changed:
Position of additional functions button
Icons for additional functions
Minor UI changes

Changed Additional Functions Menu UI
Added Refresh Function to Additional Functions Menu
Minor UI Changes

Removed Refresh Function from Menu
Merge remote-tracking branch 'origin/hackathon_al'

Conflicts:
	grid.js