Sync CHANGELOG with 2-1-stable branch
railtie.rb gets required directly, and needs VERSION.

Fixes #131.
Merge pull request #133 from matthewd/version_require

railtie.rb gets required directly, and needs VERSION
Mimic the production behavior on tests and add CHANGELOG entry
:uglify -> :uglifier
Merge pull request #141 from braddunbar/uglifier

:uglify -> :uglifier