Extract dependency tracking from Digestor
Allow registering custom dependency trackers
Use a thread safe hash
Return an empty array if no tracker is found
Rename ErbTracker to ERBTracker
Register trackers on extensions, not handlers
Added documentation about how touch now throws an error when one tries
to use it on an unpersisted object.
Keep second fraction when DateTime#change is called.
Merge pull request #9390 from chris-baynes/datetime_sec_fraction

Keep second fraction when DateTime#change is called.
Merge pull request #9409 from wangjohn/adding_documentation_to_touch

Added documentation to touch throwing an error
some minor AR changelog modifications [ci skip]
Merge pull request #9412 from senny/clean_ar_changelog

Some minor AR changelog modifications [ci skip]
Improve `rake stats` for JavaScript and CoffeeScript.

Ignore block comments and calculates number of functions.
Merge pull request #9072 from htanata/statistics

Improve `rake stats` for JavaScript and CoffeeScript
Merge pull request #8530 from dasch/dependency-trackers

Custom dependency trackers for the template digestor
:scissors:
Use sass compressor as the default CSS compressor

With the new sprockets-rails we need to explicitly set the CSS
compressor.

See https://github.com/rails/sprockets-rails#changes-from-rails-3x
Revert "Use sass compressor as the default CSS compressor"

This reverts commit 3eef1c7c5d0c4538efb9e061b6fe68011f0352b1.
The css compressor should be set in sass-rails plugin. Check
https://github.com/rails/sass-rails/commit/339529f9f6433047df6358c0439e6641cb74f045
for the fix.
Preparing for 4.0.0.beta1 release
Do not use --local option when installing the gems