UI redesign 

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