Refactor gitignore
Replace tab with spaces
Change comments and idea module dirs
Simplify world listing and change to dates in ISO 8601 format. WOO ISO 8601 !
Merge pull request #535 from mkalb/gitGradle

Refactor gitignore and build.gradle
Rename a Dev class to avoid a naming conflict in IntelliJ. This previewer hasn't actually worked for who knows how long anyway (wonder how long ago we deleted "Biomes.png" ..) - but don't want to start a deletion spree or anything
Merge branch 'develop' of https://github.com/MovingBlocks/Terasology into stackable-chunks-2