cucumber-expressions: add go implementation

[charlierudolph]

Summary

Adds a go implementation for cucumber-expressions.

Details

Looked at the java / javascript / ruby implementations and ported to go.

Motivation and Context

I want this for building the shared binary and so the go version of cucumber can use them in the mean time

How Has This Been Tested?

I ported over all the tests from the javascript implementation (and some from other implementations that weren't in the javascript implementation). I'll try and make them consistent in another PR.

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).

Checklist:

• I've added tests for my code.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[aslakhellesoy]

Excellent work @charlierudolph!!

Could you port #346 into this PR please? Then I'll merge it to master and also set up a read-only subrepo, and CI.

I'm on holiday and will be back in a week or so.

[aslakhellesoy]

I've merged to master and set up a read-only subrepo mirror at https://github.com/cucumber/cucumber-expressions-go.

The Travis build is OK, except for Go 1.7: https://travis-ci.org/cucumber/cucumber-expressions-go/builds/362455501

I can't think of a good reason to support Go 1.7, so I'll just remove that requirement.

Exciting stuff indeed!

[lock]

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