syntax highlight last example in README

Add a twisted resource for exposing metrics via twisted.web.

Follow naming conventions for graphite bridge tests

Fix test_exposition.py on Windows

Add helper methods to make it easy to start a prometheus server as WSGI
app. This makes it easier to integrate with other WSGI applications like
flask or to start exposing metrics in your WSGI server of choice.

Add WSGI helper methods

Classes are relatively expensive to create, and particularly disadvantageous on PyPy.

Unnest the Timer class

Adds support for the WSGI server to read from a different registry

Add CI, make tests pass on non-linux

Make tests pass on Python 2.6

Fixes #77

Bundle decorator.py and fix decorators

Allow passing label values as keyword arguments

Code:
- remove unused imports
- remove a useless try/except/raise that wraps a os.path.join()

Style:
- max line length 119
- use 4 spaces for indentation
- fix indentation of continuation lines

Clean up the ProcessCollector.

* Add optional scheme support for gateway urls

* Add requested documentation updates

* Update documentation. Resolve python 2.6.9 bug

* Remove unneeded imports