moved loadGlobalStyles() into new styler module
moved sortStyles() into styler.js, cleaned up docs and comments
add loadAndSortStyle() to styler.js
moved loadStyle() into styler.js, removed "manifest" from signature
fix bug in generate unit tests
moved createVariableStyle() into styler.js, fix references in parsers
moved generateStyleParams() to styler.js, fix references in parsers
removed unnecessary local STYLE_EXPR_PREFIX
Merge pull request #133 from appcelerator/ALOY-650

[ALOY-650] Abstract all style handling code to single module