Byron/form submission

Added the following:
- MainActivity (splash page with two buttons: "register" and "services")
- RegisterActivity - uses 2 Fragments:
     > AccountRegistrationFragment (contains all "PA" fields in the original sign-in sheet)
     > EventRegistrationFragment (holds all "R" fields) 
- All related layouts, strings, dimensions, etc. 

Notes:
- RegisterActivity should eventually FIRST go to an "Already Registered?" query. 
     > If YES, RegisterActivity should redirect to a SearchActivity and then to EventRegistrationFragment
     > If NO, RegisterActivity should proceed with the current flow: AccountRegistrationFragment and then Event RegistrationFragment) 

Todos: 
- Save entry data in sharedpreferences
- Add stricter formatting and logic to forms 
Are the commented lines necessary/do you plan on implementing this later?