Added Navbar
Init
added sign in message
Merge remote-tracking branch 'remotes/origin/Edgar' into David

Conflicts:
	app/views/layouts/application.html.erb
Merge remote-tracking branch 'remotes/origin/Edgar' into David

Conflicts:
	app/views/layouts/application.html.erb
Added columns and styles
Tweets con formato
Tweets con formato
Todo funciona menos los glyphicons y nuevot twwet