#10: GDB: file data isn't copied properly between functions 

- Changed return type of FileLoader.toString() from "string" to "const
string"
- FIX: FileLoader.toString() sets get position to beginning before
reading data
- FIX: LoadShaders.CompileShader() no longer uses a dangling pointer to
shader data

Task-Url: http://github.com/BlackCrowned/OpGLLib/issues/issue/10