1. memory leak problem fix.
2. null pointer fix. in scene node.
again
???
everything works fine.
everything fine.
now merge
1. jni structure changed.
2. fix memory problem.
3. gles2.0? has problem to be fixed.
Merge branch 'master' of https://github.com/zjtuzteproject/IrrAPI.git

Conflicts:
	IrrApp/jni/COGLES2FixedPipelineShader.cpp
	IrrApp/jni/COGLES2FixedPipelineShader.h