v0.3.1

• ControlParam with special <control_code> section in XML, that allows to execute
  python code for dynamic parameters manipulation
• ShaderInfo class for parsing compiled shaders parameters
• Lib/RIB/shaders/ReadShader.xml node that uses ShaderInfo call inside <control_code> section
  for reloading shader parameters
• NodeParam new attributes : enabled, spaceDef, arraySize, defaultArray, valueArray (though arrays parameters support is not fully implemented yet...)
  btext (button text for button ControlParam)
  removable (for removing dynamcally added parameters as in read_shader.xml example)
• Fixed some shading nodes, code, shaders and textures for Air, Aqsis, Pixie and RenderDotC compatibility
• Tested on PyQt 4.10.2 that was linked with Qt 5.0.2 libraries.
• New service nodes in Library