Added remapping of internal texture formats to GL_RGBA etc when just the number of components is used i.e. 
Added remapping of internal texture formats to GL_RGBA etc when just the number of components is used i.e. 

  1 -> GL_ALPHA,
  2 -> GL_LUMINANCE_ALPHA
  3 -> GL_RGB
  4 -> GL_RGBA



openscenegraph/osg,artoolkit/osg,scrawl/osg,tomasthoresen/osg,scrawl/osg,tomasthoresen/osg,artoolkit/osg,tomasthoresen/osg,marchelbling/osg,artoolkit/osg,jtorresfabra/osg,marchelbling/osg,openscenegraph/osg,marchelbling/osg,jtorresfabra/osg,openscenegraph/osg,scrawl/osg,openscenegraph/osg,artoolkit/osg,scrawl/osg,tomasthoresen/osg,jtorresfabra/osg,marchelbling/osg,jtorresfabra/osg