[WIP] Moved docs to readthedocs

This is were it all starts :) I've moved the docs from padraic/mockery
to this repo, reorganized them and converted them to reStructured Text.

Todo
----

 - [ ] Add sphinx files

Discussion
----------

I've reorganized the docs a bit into 3 (4 actually) sections, I'd like
to get some feedback on this.

The current doc TOC:

**Getting Started**
- installation
- upgrading
- a simple example

**Reference**
- startup methods
- expectations
- argument validation
- partial mocks
- mocking public properties
- mocking public static properties
- mocking pass by reference behaviour
- mocking demeter chains
- mocking object recording
- mocking final methods/classes
- mocking magic methods

**Reference/mockery**
- configuration
- exceptions
- reserved method names
- gotchas

**Cookbook**
- default expectations
- detecting mock objects

/cc @davedevelopment, @GrahamCampbell