Asynchronously load bidbundle for performance wins!

@fmarier - could you review?

* Add a CryptoLoader module that loads jwcrypto on demand.
* Update the build script to replace '/production/bidbundle.js' references in the JS with the cachified version.
* Force bidbundle.js to be compressed before everything else.

I have a bundle of numbers to show performance improvements: http://www.pastebin.mozilla.org/2294467

Furthering the goals set out in issue #3060