Fix two errors in doula/tests/test_github.py
doula/tests/test_push.py: Remove unused `import ipdb` - hopefully gets
rid of IPython warning on Mac
Eliminate warning about deprecated `sets` module
doula/tests/test_service_config_dal.py: Fix error: "AttributeError:
'ServiceConfigDAL' object has no attribute '_get_latest_service_config'"
Fix failure: doula.tests.test_release.ReleaseTests
Fix 2 instances of "TypeError: repo() takes exactly 2 arguments (1
given)"

though the 2 tests that had this error now error out while doing the
`git clone`.
Fix "AttributeError: 'NoneType' object has no attribute 'settings'"
errors if you run `python doula/tests/test_sites_dal.py` by making sure
that a Config is loaded so Config._instance != None
Fix 3 instances of "TypeError: __init__() takes exactly 1 argument (5
given)"

Fixes GH-18
Fix "ImportError (cannot import name get_proper_version_name)" error by removing unused import.

Fixes GH-19
Fix "AttributeError: 'Service' object has no attribute 'config'" error
in doula/tests/test_service_view.py

Fixes GH-20
Fix "TypeError: build_release_manifest() takes exactly 4 arguments (3
given)" error in doula/tests/test_service_view.py by adding `sha`
argument to call to `build_release_manifest`.

Fixes GH-21
push.packages => push.packages_to_node in doula/tests/test_push.py

Fixes GH-22
Eliminiate unnecessary imports in doula/tests/test_push.py
Use keyword args to Push contructor so code is easier to understand
Wrap long line on to multiple lines in doula/tests/test_push.py
Merge pull request #23 from msabramo/fix-test-errors

Fix test errors