Add code coverage reports sending to codecov.io

[Ladsgroup]

Also adding notifications on IRC

[halfak]

$ codecov
/home/travis/build.sh: line 41: codecov: command not found

[halfak]

$ codecov
Traceback (most recent call last):
  File "/home/travis/miniconda/bin/codecov", line 7, in <module>
    from codecov import main
ImportError: No module named 'codecov'

[halfak]

Maybe you need to add pip install codecov here: https://github.com/Ladsgroup/Revision-Scoring/blob/master/.travis.yml#L39

[codecov-io]

Current coverage is 86.12%

Branch #205 has no coverage reports uploaded yet.

No diff could be generated. No reports for master found.

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