UI cleanups for new account creation

* Improve appearance of basics screen and use simplified text
* Provide alternate text when in EAS account setup flow (from acct mgr)
* Change "Exchange/ActiveSync" button to "Exchange account"
* Add some spacing to the three buttons, to improve appearance

Bugs addressed:
2128055 Change string in account picker activity to Exchange
2132713 Welcome message for Email app is inappropriate when coming from
          Settings -> Accounts & sync -> New account
1 file changed