Fix small bug with dirty attributes and list assignment as an array.
Add spec to assert issue with dirty attributes

* When using a delimiter different from "," the dirty attributes
  should remain empty when assigning the topic list with an array:
Reduced method's name length
Merge pull request #442 from seuros/master

[MIsc] Reduced method's name length
Mark build as failed as soon as any test fails
Reduce gems required to run tests
Make appraisal task easier to run; update travis config
Merge pull request #445 from mbleigh/fix_appraisal_task

[Misc] Make appraisal task easier to run; run it under travis
Add rails_4.1.gemfile
Pass column = nil to quote_value explicitly for compatilibity with ActiveRecord 4.1

https://github.com/rails/rails/commit/31a43ebc107fbd50e7e62567e5208a05909ec76c
Override count() with count(:all) for compatibility with ActiveRecord 4.1
Remove trailing whitespace
Stub CHANGELOG
Update migration installation command instructions
Update testing instructions; move to bottom
Add link to release candidate gem
Requiring acts_as_taggable_on warns to require acts-as-taggable-on
Bump to 3.0.0.rc2
Bump to 3.0.0; update CHANGELOG
Correct README re: 3.x now released