Theme now support helpers

Conflicts:
	app/decorators/post_decorator.rb
	config/application.rb
I18n regression
Theme now supports helpers! Also moved theme structure

Rails helpers are now part of themes the same way you can use them in
app/helpers. The default theme has changed to reflect the current state
theme structure
Merge branch 'master' into marmite

Conflicts:
	config/application.rb
	themes/default/helpers/post_decorator.rb
Actually implemented decorators, not helpers...

I was up last night a bit too late ;)

Renamed helpers to decorators as this is what it actually was.
Configuration now load theme's helper AND decorators which means that
themes now support Decorator AND helpers
Merge branch 'master' into marmite

Conflicts:
	config/application.rb
Fixed theme