Feature TDD refactor

What's done:

- Added [FlexPMD](http://sourceforge.net/adobe/flexpmd/home/Home/) static code analysis generation.

Output rendered with FlexPMD violations viewer:

    https://dl.dropboxusercontent.com/u/1375050/starling-flexpmd/index.html?report=pmd.xml

Tip:

> Select 'Show violation level' => 'all' & Press 'Filter'

(It uses the latest non-official 1.3 version from [here](https://github.com/PeterHoeche/adobe-flex-pmd))

Original project which FlexPMD is based on: 

http://pmd.sourceforge.net/pmd-5.1.2/