Added more documentation, fix a typo in README.md, add long_description to package

[jchristgit]

I went ahead and added some more documentation. This PR's main purpose is to add a Setup and a Usage section to the documentation, but I also added / changed some other things:

• I added more content to README.rst, including some basic usage examples, taken mostly from the current README.rst. I originally tried to convert the entire current Markdown README to RST, but that turned out to not really work.
• I made small changes to setup.py. Namely, the License qualifier had GPLv3, but looking at the short 'MIT' license specifier there and in this repo, I assume you forgot to replace this in 9148b649a086d6ae77378ed708dfdd52dfcf2a42. I also made it read the contents of README.rst as the long_description, resulting in it being displayed nicely on PyPI. Currently, this shows nothing. I tested this on TestPyPi.
• I think you had a typo in the README, suggesting {'sample@gmail.com', 'Sam'} for aliasing recipients, so I changed the , to a :

About the new documentation itself: It should be fairly similar to the current README, giving people a overview for installation and usage, so the table of contents currently look like this:

If there is stuff that I should add / change / remove, please let me know. 😄

[coveralls]

Coverage increased (+1.2%) to 53.386% when pulling d460b0b852965980dfc7aed5c0bd7369c4cd3d56 on Volcyy:doc-overhaul into 5d2f49c4a3c4f186039e479524340482b61856a8 on kootenpv:master.

[kootenpv]

Wow, thanks so much for taking the time to improve it allover. It really could use... Including reorganizing some sections! When I get back later I'll deploy to pypi!