Bamboo server can be set for tests

Use:
 TEST_BAMBOO_URL="http://localhost:8080" nosetests
to forward the tests to a local installation.

Some tests are still taregtting the bamboo.io server intentionally.
It is possible to change it (while offline) using:

 DEFAULT_BAMBOO_URL="http://localhost:8080" TEST_BAMBOO_URL="http://localhost:8080" nosetests
Merge pull request #25 from modilabs/change_bamboo_url_tests

Bamboo server can be set for tests