Password and Existing User validation Added

-Password validation updated. (Password must be between 4-32 chars and
contain at least one numeric character.
-Added check on user registration to confirm whether or not user already
exists.
-If user already exists, Throw error message.
-Also, updated password handling to encrypt passwords before
being handed to mysql. (noticed that i'd forgotten to encrypt them
and they were being stored as plain text when user registered from
registration form)
Merge branch 'master' of github.com:inspektorGadget/VCP279