tuning modules into objects: engine.js
turning modules into objects: entities.js
restructured code; engine object with private parts in closures; adjusted calls in main.js and testing.js
renamed engine's main loop start function
refactored ressource_pop.js into resPop.js, now in object form for better modulization, adjusted variable casing
ressource_pop.js replaced by resPop.js
Merge pull request #1 from robten/objectified

objectified merged into master