Tweaks various rendering related parameters and adds a new render pass which combines the transparent and the opaque RTs.
Dramatically speeds up automatic HDR exposure update using double buffered PBOs and cleans up some variable names.
Reactivates dynamic HDR eye adaption for the lowest graphics setting.
Adjusts alpha test reference value in chunk shader.
Tweaks water fading at shores.
Fixes #453.
Merge remote-tracking branch 'parent/develop' into develop
[intern] using slick (236) and lzma(1.2) from maven repos
[fix] add missing additional maven repo for subprojects
Minor Checkstyle fixes
Merge remote-tracking branch 'parent/develop' into develop

Conflicts:
	src/main/java/org/terasology/world/block/loader/BlockLoader.java