Added routing on template, and created user registration form.

Convert current template(index.html) into a layout template.
Our layout contains the navbar at the top and the footer. Any other view
would be included from "includes" directory. More info available
[here](http://docs.angularjs.org/tutorial/step_07)...

When navigating to the webui, a welcome view is shown (displaying the
message *Welcome to TRACER* ). New user registation form is moved at a
seperate view. By clicking to User (upper right corner) -> Create New
User, the form is displayed. Added primitive form validation, as well.

**TODO**
 - Write tests for login.html and newly created views.
 - Fix various bugs.
 - Continue with mockups.