httpretty Needs to be here for now even though it's a dependency of
boto. A pip install on a fresh system will decide to target httpretty
0.8.10 to satisfy other requirements, and httpretty 0.8.10 has bugs in
setup.py that prevent it from being successfully installed (at least on
Python 3.4).
Pinning SaltTesting to 2015.2.16 is not right--integration tests will
not run with this version. Let pip install the latest minimum version
instead.
Include SaltPyLint since anyone doing development work will also want to
run pylint.
