Ui redesign

(Issuing another PR duplicating thomas' in the hope that it will fire off travis CI this time)

Following implementation are done:

dropdown /pull down panel for email password, login button and new org registration
https://www.pivotaltracker.com/s/projects/742821/stories/58807822

adjust the navigation links
https://www.pivotaltracker.com/story/show/58807718

inserted new logo
https://www.pivotaltracker.com/story/show/58696394