Pact.Term and and SomethingLike flexible matchers.

[mefellows]

This PR implements the DSL stolen from https://github.com/DiUS/pact-consumer-js-dsl/wiki/Flexible-matching. In summary:

• Introduced the Pact.Match.term and Pact.Match.somethingLike methods to the DSL
• Bumped pack-mock-service version to 0.7.0 (in both browser tests and example project) so that we can test against Pact2 specification
• Introduced a run-browser-tests-pact2 task that executes the tests in the context of a mock service with the --pact-specification-version 2 option, ensuring backwards / forwards compatibility of the DSL
• Updated main Readme to include flexible matching

[bethesque]

Thanks Matt!

[mefellows]

Awesome thanks!

[davidchin]

Nice work on getting this merged! :smile: Are you guys planning on releasing a new version including this change?

[bethesque]

Released 0.2.0