fix usage of assert for release build
set sound to emitters
delete debug messages + delete useless variables
fix double definition error
deactivate assert for more particles
merge master
Merge pull request #39 from lanice/sound_on_emitters

set sound to emitters
remove osg, add glow, glm #40

compiling, no draw call yet
create glow window
use glfw directly instead glowwindow #40
add keyCallback to main.cpp. Pressing ESC now ends the game. #40
fix glowutils package-adding in CMakeLists.txt #40
replace std::err messages with glow::fatal. #40

glow output:
* glow::info()
* glow:: debug()
* glow::warning()
* glow::critical()
* glow:: fatal()

see https://github.com/hpicgs/glow/blob/master/include/glow/logging.h
add F5 Key for reloading... does nothing at the moment. #40
add version check and output at start. #40
add error callback. #40
add FindGLEW.cmake to resolve GLEW finding issues. #40
add proper initialization of GLEW in main.cpp. #40
add GLOW initialization (which does GLEW init for us). #40
add simple eventHandler to Game class. #40