Moving changelog to GitHub
Bump 2.2.1
Travis: Test against Rails 4.1
Travis: Use the added Gemfile for Rails 4.1
Migration should be a .rb file
Tests: Use the migration generator template

This makes sure that the template is tested, too
allow empty value setting
make gem require itself properly
move installation description to top of readme
add readme about deleting settings
Bump 2.3.0
Convert specs to RSpec 3.0.0 syntax with Transpec

This conversion is done by Transpec 2.2.1 with the following command:
    transpec

* 102 conversions
    from: obj.should
      to: expect(obj).to

* 26 conversions
    from: == expected
      to: eq(expected)

* 9 conversions
    from: obj.should_not
      to: expect(obj).not_to

* 6 conversions
    from: be_true
      to: be_truthy

* 1 conversion
    from: failure_message_for_should { }
      to: failure_message { }

For more details: https://github.com/yujinakayama/transpec#supported-conversions
RSpec: Support block argument for #perform_queries
Travis: Use latest gems
Updated exception