Adding i18n to wsapi. Split strings into client.po and messages.po.

Switched email from mustache to EJS templates.

Created fake locale db-LB for development and debugging.

Updated scripts.
See http://viewvc.svn.mozilla.org/vc?view=revision&revision=99911

implement graceful shutdown of bcrypt compute processes.  fix bcrypt.get_rounds (was throwing an exception)

remove the deep __heartbeat__ checks performed from browserid (the webhead), while dbwriter should ping the database to ensure health - closes #566

initial implementation of request forwarding, cookies set from dbwriter are still not being properly passed through - issue #460

add the dbwriter process.   it's not yet hooked up, but starts up and runs, and included in health check.

reorganize browserid process - break out view serving and wsapi handling.  preparation for dbwriter split.  issue #460