meta: Investigate various Continous Integration services

[mewmew]

Investigate which Continuous Integration services to use for:

• 2014-09-21: build status for commits and pull requests (SUCCESS/FAILURE)
• 2014-09-21: test cases (PASS/FAIL)
• 2014-09-21: code coverage (percentage)
• benchmarks? (percentage delta)

[mewmew]

Continuous Integration of benchmark deltas would be nice to have but are not a requirement of the project. Closing for now, but would be glad to reopen if the need of such becomes more apparent in the future.

[mewmew]

For future reference these steps may be taken to enable CI for a repo with support for build status, test cases and code coverage:

1. Enable repo at https://travis-ci.org/profile/mewmew.

2. Enable repo at https://coveralls.io/.

3. Add .travis.yml.

4. Update the encrypted coveralls.io token in ".travis.yml".

   travis encrypt COVERALLS_TOKEN=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
   

5. Add build status, cover status and GoDoc references to the readme.

   [![Build Status](https://travis-ci.org/USER/REPO.svg?branch=master)](https://travis-ci.org/USER/REPO)
   [![Coverage Status](https://coveralls.io/repos/github/USER/REPO/badge.svg?branch=master)](https://coveralls.io/github/USER/REPO?branch=master)
   [![GoDoc](https://godoc.org/github.com/USER/REPO?status.svg)](https://godoc.org/github.com/USER/REPO)
   

6. ...

7. Profit.