Add coveralls support

[renatomassaro]

This change is 

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[AugustoResende]

@renatomassaro please tell with community!

[renatomassaro]

I'll leave this PR on hold for a while because Coverall's api is slow and with some downtime. Their status page: http://status.coveralls.io/

[renatomassaro]

@GabrielAugustoTI I will, wait a little bit more plz.

[AugustoResende]

I only have 6 questions for you:

Will the HE1 legacy never become open source?
Why HEBorn was not released on 07/08?
Is there a problem with my project to rewrite the HE1 Legacy backend?
Why was the promise of better communication with the community forgotten?
When are you going to hire a community manager?
Will HE2 really be released?

[renatomassaro]

Will the HE1 legacy never become open source?

I'm open (no pun intended) to it. See https://github.com/HECommunity/HELegacy/issues/2

Why HEBorn was not released on 07/08?

Problems.

Is there a problem with my project to rewrite the HE1 Legacy backend?

Other than the domain name, none at all. I'd actually like to help however I can.

Why was the promise of better communication with the community forgotten?

Problems, no time etc. The usual excuses.

When are you going to hire a community manager?

Whenever I have the money for it.

Will HE2 really be released?

No, we are just completely wasting our time here and will delete the whole repository as soon as we finish the project.