Update javascript [dojo] in the ambra/registration/webapp project

[jkirton]

The javascript in the ambra/registration/webapp project is a cloned sub-set of pre 0.9 ambra/webapp javascript including an entire clone of the old (0.4.3) dojo library!

The dojo library should be removed from this project entirely and a separate dojo build profile (in the ambra/libs/js project should be created to accommodate all dojo dependencies for this project.

Additionally, we should eliminate the ambra/registration/webapp project's dependency on the prototype library (prototype.js) as dojo should be able to handle whatever prototype is currently tasked with.

[amit]

Not for 0.9

[josowski]

(In [7337]) Removes the Dojo 0.4.3 dependency from Registration and CAS and repoints the Registration and CAS modules to use the ambra-js module.

Addresses #997

[rcave]

I've verified that the registration and login screens are functioning correctly after pointing these modules to the ambra-js module.