created scores_controller.rb; levels now create new score items when victory is achieved
refactored presentation of completed levels on Users#show
removed "Continue your game" link for users who have completed all levels
added level 3 files
fixed victory conditions bug when levels have leftover blocks
added level 4 files
fixed bug where empty cells prevented clicking obscured (but visible) game blocks
prevented blocks from leaving the #main div
styling tweaks for blocks and solution
added click-to-deactivate feature