start testing against Ruby 2.0 and 2.1
start testing against Rails 4.1
Rails 4.1 compatibility

* only require HABTM if Rails < 4.1
* the ActiveRecord ConnectionSpecification Resolver has changed its initialization process
* adjust specs to no longer use previously-deprecated and now-removed finder methods
* `scoped` is no longer a valid method, use `all` to check the result instead (thanks @aprescott!)
Merge pull request #225 from agrobbin/rails-4-1

Rails 4.1 support
Convert specs to RSpec 2.99.1 syntax with Transpec

This conversion is done by Transpec 2.3.6 with the following command:
    transpec -b true,false

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

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

* 38 conversions
    from: be_true
      to: be true

* 34 conversions
    from: be_false
      to: be false

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

* 11 conversions
    from: obj.stub(:message)
      to: allow(obj).to receive(:message)

* 9 conversions
    from: lambda { }.should
      to: expect { }.to

* 4 conversions
    from: lambda { }.should_not
      to: expect { }.not_to

* 2 conversions
    from: pending
      to: skip

* 1 conversion
    from: =~ /pattern/
      to: match(/pattern/)

* 1 conversion
    from: =~ [1, 2]
      to: match_array([1, 2])

* 1 conversion
    from: before { example }
      to: before { |example| example }

* 1 conversion
    from: obj.should_not_receive(:message)
      to: expect(obj).not_to receive(:message)

For more details: https://github.com/yujinakayama/transpec#supported-conversions
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