Started putting something into README file.
Fixed PEP8 compliance and cleaned up, using tabs instead of spaces.
Added first example and install instructions to README.md file.
Added documentation to the methods

The new documentation should be able to better introduce someone to
TeamCity, as well as explain how the API works in less time.

The comments have been added to explain what each method does (for the
`get_...` methods), and also what sort of URL that builds.

	modified:   tc.py

No issues fixed.
Added one more example in the README.md.
Small mistypes in the documentation for one of the methods.
Added get user by username to tc.py
Merge pull request #1 from jslvtr/master

Extensive comments and find_user_by_username