Remove obsolete module development docs

In the route53 module, documenting that TXT and SPF values must be surrounded by quotes

must be surrounded by quotes.

Otherwise you get a cryptic error message from Route 53.

Allow custom nosetest parameters

The NOSETESTS variable can be used to support customizing the nosetests
parameters.  This allows providing custom nose parameters such as
--with-coverage.

Minor readme tweaks since I haven't edited this in a while.

Added ansible-vault to the installer

fix json typo in documentation

Various tests using datafiles are being moved into the integration test framework (tests_new right now).

The unit test infrastructure will remain for things that are mocked out and testable with out filesystem
side effects, and a few cases of things that might not be quite so much (like inventory) that can still
benefit from heavy access to the API.

See the 'tests_new/integration' directory, this will soon fold into tests_new.

we're a little further along the units directory will be reserved to pure-API tests.

We had some incorrect logic for when selinux is installed and disabled.

This occurred when a hash would be passed in via extra args and the
hash variable behavior was set to 'merge', which resulted in the
variable from extra args replacing the playbook variable.