updated readme
layout refined

SASS files modularized (settings, one for each tab).
compass needed for CSS compilation.
Removed old clutter.
changed path for SASS files
further restructuring

Wordpress plugin files now in folder `wp-player-plugin`.
Added task `grunt watch`for SASS and JS files.
Compress and minify on `grunt build`.
Moved all files and folders from `build` to project root.