CI: Add coala in CI

[gaocegege]

Now our builds on Travis CI does not check coala issues.

[kiryteo]

Can I work on this.?

[kiryteo]

How can I proceed and what is the expected outcome for this.?

[gaocegege]

@kiryteo

There are some errors when we use coala: #23 , but you do not need to deal with them. This issue is to import coala into Travis CI build, so if you could add coala --ci into the config yaml file, and it works, then it works for me.

[kiryteo]

I tried adding '-run coala --ci' in the travis.yml script section but the build fails..

[gaocegege]

@kiryteo

Yes but it does not matter. It is caused by #23 and you could file the PR and I will review and merge it if it could report errors in the CI build.

[kiryteo]

I'll make the PR with modified travis.yml file..

[Makman2]

Btw: I've enabled coala analysis via gitmate, I hope it works for future PRs too (but I haven't seen it on the PRs yet, so let's do this issue anyway)