Pushing to coveralls cloud broke the contributing

[wizicer]

Here is my suggestions:

• separate the pushing to coveralls cloud step from npm test to something like npm publish
• write a contributing section in readme to help someone other willing to contribute.

In case you want to know the error executing from my fork, here it is:

/home/icer/RedmineCLI/node_modules/coveralls/bin/coveralls.js:18
        throw err;
        ^
Bad response: 422 {"message":"Couldn't find a repository matching this job.","error":true}
npm ERR! Test failed.  See above for more details.