Fix for issue #529.

* replaced precondition with if-statement in class ChunkMeshInfo.
Merge branch 'develop' into monitoring
Merge branch 'develop' of https://github.com/MovingBlocks/Terasology into monitoring
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
Miniscule fix for missing space in single player ui.
Fix for issue #532.
Merge #530 by @mbrotz to fix #529
Added DoubleClickListener to module dialog.
 Double clicking toggles mod selection.
fixed core mod toggle bug.
Merge pull request #1 from MovingBlocks/develop

Develop
Adventure-Mod ...:
-An invisible block
-TNT-Chest
-Trap Doors! Maybe something for the core module. Thanks to Janred for the shape!

Will soon expand this module, just wanted to share the current state.
Update settings.gradle
Implemented a watchdog for issue #534.
Merge pull request #540 from mbrotz/bugfixes

Implemented a watchdog for issue #534.
Add placeholdery Light & Shadow module. Also include two missing dirs in module dirs and tweak the applet jar lineup