add texture loading for rain. assertion occurs
fix rain texture setting.
better rain
add strength in shader
merge master into newRain
add rainStrength uniform to flush.frag
Merge branch 'newRain' of github.com:lanice/elemate into newRain
remove farPlane moving, change fog behaviour, add timed rain
add rain achievement
adjust fog with rain, fade rain sound in/out
Merge pull request #141 from lanice/newRain

New rain
add Game, World doxygen, cleanup #133
cleanup undeclared functions #133
Merge branch 'master' into skybox_17

Conflicts:
	libelemate/rendering/renderer.cpp
	shader/flush.frag
skybox nice etc #17