experimental: remove all inline styles from #content in ALPHA

This bold move scrubs inline styles from alpha. This allows us to
assess the benefits inline styles provide and use this as a springboard
for targeting styles via classes and stylesheets instead.

This is cheaper than doing on the server side.
See http://www.mediawiki.org/wiki/Deprecating_inline_styles for more
information on problem

Change-Id: Ia36ed825fbfb5290af06382d35cc61102b1457dc
Merge "experimental: remove all inline styles from #content in ALPHA"