[build] Updating asset compilation to utilize antrun.

CHANGELOG
=========
* Updated `bin/installer.bash` to remove requirejs building.
* Updated `pom.xml`
  * Removed requirejs plugin
  * Added antrun and antrun call.
* Updated a number of JavaScripts to improve compatibility with the
  closure compiler.
* Updated `docs/WEBUI.md` to reflect new asset compilation setup.
Merge pull request #5 from airbnb/smarter-assets

[build] Updating asset compilation to utilize antrun.