Reword docs of shorthand syntax

* Remove "As alternative to JSON" clause
* Use the param types instead of value1, value2.  This is confusing
  when a key name is "value".
Fix test failure when run on windows

Explicitly specifying "python" to run the test.
We're really just checking the output of version in as high
a level as possible (outside of code/objects) to make sure
we don't regress on this again.
Update search path processing to work on windows

We have to use os.path.abspath because this will capture the
current drive we're on.  Otherwise if our cwd is on a different
drive, we'll build our search path based on the current drive.

I've also switched the path separator to os.pathsep.

See (aws/aws-cli#101) for more details.
Merge branch 'windows-path-fix' into develop

Fixes #101.

* windows-path-fix:
  Update search path processing to work on windows