Comment clarification.
Fixed :next_version method to return the live model when appropriate. Close #200
Updated config/application.rb and the Environment configuration files for the dummy app to match those generated by Rails 3.2
Added basic test coverage for a model that invokes  for protection from mass assignment.
Swapping in :select for :keep_if on changes array in :changes_for_paper_trail method for Ruby1.8.7 compatibility.  Close #206
Fixing issues stemming from previous commit in Ruby 1.8.x.
Fixing the SerializerTest so that it doesn't engage an assertion for equality when the test suite is run in Ruby1.8, which cant consistently pass in Ruby1.8 due to the nature of hashes being unordered.
Updating notes for setting custom serializer on README to use shortened syntax available in pending release.
Bump to 2.7.1
Fix Gemfile to use 'https://rubygems.org'
Adding a test to confirm #161 is not an issue.
Add Ruby 1.9.3 and 2.0.0
Removing ruby 2.0 from .travis.yml since there are some compatibility issues with the current release of Rails 3.2
Adding Ruby2 back onto .travis.yml but with failures allowed, as per req #210
Merge branch 'master' into rails4

Conflicts:
	.travis.yml
	Gemfile