Added clean task to gulp
Optimized tileset
Enabled drop probability
Optimized 'this'
Fixed sprite frame for key
Fixed error with last level
Optimized 'self' in level
Fixed minor issues with end scene and earth power
Merge pull request #4 from satanas/feature/ai

AI for enemies
Optimized requestAnimationFrame and cancelAnimationFrame
Optimized randInt, requestAnimationFrame, cancelAnimationFrame, visible, instructions and 'this' in items.js. Added compatibility for other browsers in caf and raf
Optimized tileset
Optimized this and self in all the files
Reached a high level of optimization and still under 14kb :(
Enabled again fow
Improved Date.now method. Fixed some strings. Removed vulnerabilities on enemies. Zombies make more harm. Life and mana is kept through levels
Removed credits. Optimized some methods. Optimized css and html. Current size 12665 bytes
Adds route recalculation, fixs final point bug and validates planted for enemy movement
Merge from master