Convert specs to RSpec 3.0.2 syntax with Transpec

This conversion is done by Transpec 2.3.1 with the following command:
    transpec

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

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

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

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

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

* 4 conversions
    from: =~ /pattern/
      to: match(/pattern/)

* 4 conversions
    from: > expected
      to: be > expected

* 3 conversions
    from: be_true
      to: be_truthy

* 2 conversions
    from: be_false
      to: be_falsey

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

* 1 conversion
    from: <= expected
      to: be <= expected

For more details: https://github.com/yujinakayama/transpec#supported-conversions
Add tests
Add `to_json` to struct
Comments
Update readme
Merge pull request #30 from ahuth/update-rspec-syntax

Convert specs to RSpec 3.0.2 syntax with Transpec
Merge remote-tracking branch 'upstream/master' into pretty-print

Pull request #30 has updated upstream/master with new rspec syntax
Call `reflections` on class instead of instance

Reflections refactored in Rails 4.1:
https://github.com/rails/rails/pull/15300
Merge pull request #32 from ahuth/update-reflections-use

Call `reflections` on class instead of instance
Merge branch 'master' into pretty-print
Cleanup comments
Merge pull request #31 from ahuth/pretty-print

Pretty print
Updated presenter to represent polymorphic associations as a Hash with the object id & table name
Bumped version and updated the change log.
Updated change log.
Updated presenter to return nil as value for polymorphic attribute if association is not present
Merge pull request #33 from mavenlink/support_polymorphic_belongs_to

Updated representation of polymorphic 'belongs_to' associations
allow skipping of polymorphic associations