Update jruby version
Add rspec-its gem to run specs with rspec 3.0
Bump jruby version to 1.7.15
Add pry gem to help in debug
Upgrade rubyzip dependency to 1.1.6
Merge pull request #11 from andreanastacio/update-rubyzip

Update rubyzip to >= 1.0.0

* Changelog: improvement
* fixes #10
Convert specs to RSpec 3.1.4 syntax with Transpec

This conversion is done by Transpec 2.3.7 with the following command:
    transpec

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

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

* 3 conversions
    from: it { should_not ... }
      to: it { is_expected.not_to ... }

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

* 1 conversion
    from: it { should ... }
      to: it { is_expected.to ... }

For more details: https://github.com/yujinakayama/transpec#supported-conversions
Use JRuby-1.7.16
Bump gem version to 0.2.0

* Only real change is that we now rely on rubyzip >= 1.0
* Major thanks goes to @andreanastacio who did all this <3