Added welcome screen layout

Using the storyboard I created the welcome screen layout.
Create fragment class for username
Started work on the username fragment
Added functionality (onclick listeners) to files
Adding Stefan's things to my branch
Merged my string.xml file with Stefan's branch
Have dialog fragment for username opening

Stefan and I have got the dialog fragment working but not returning to
Main Activity or returning the username
Welcome screen returns username to MainActivity
Add username to the data manager
Got rid of Datamanager bit, added title to fragment
Merge pull request #56 from CMPUT301F14T14/WelcomeScreen

Welcome screen