Refactoring the messages error codes.
Need more reviewers only appears as a label change.

* in_work if "WIP" is in the title
* in_review if a "needs more reviewers" error is found
* in_integration if no "needs more reviewers" errors exist
Merge pull request #16 from greut/labels

Labels
Enabling worker logging on Python 2.6.
If an error is found, the label is in_review.
Merge pull request #18 from greut/logging-worker

Logging worker & fix labels