Added accessor methods for rotationStartVariance in MOAIParticlePexPlugin.
Added Lua method initializeProperties to MOAIParticlePexPlugin.  Added helper method InitializeProperties().
Added member variables mMinRadiusVariance and mMinRadiusRegister to MOAIParticlePexPlugin.
Added Lua accessor methods for minimum radius variance property in MOAIParticlePexPlugin.
Added handling of minimum radius variance in InitializeProperties(), Parse(), _initRadialScript() and _renderRadialScript().
Removed TODO line in MOAIParticlePexPlugin.cpp.
Added helper methods InitializeBasicRegisters() and InitializeEmitter() to MOAIParticlePexPlugin. Refactored code with ternary operator.
Corrected capitalization of finishParticleSizeVariance element value in MOAIParticlePexPlugin::Parse().
Changed formatting of opening brackets and conditionals in MOAIParticlePexPlugin.cpp to match rest of Moai.
Merge pull request #73 from mindsnacks/feature/particle-init-properties

[FINAL] MOAIParticlePexPlugin initializing properties