Merge pull request #18 from bearnshaw/master

Add ability to read from DSN file
Eliminate redundant README
Python 3 compatibility
v0.3.3 marked
v0.3.4
Added PERSIST pseudo-SQL keyword
Standardize README to rst

* Some links were written in markdown rather than rst
* Added Python code blocks (although this might might mess up SQL highlighting)
missed a code block
Merge pull request #23 from mrocklin/readme-rst

Standardize README to rst