Rename README to README.rst to get nice ReST rendering in GitHub
Fix 'Unix' section heading reST level.
Sneak in a couple of typo fixes.
Merge pull request #2 from ramiro/readme-section-header

Fix 'Unix' section heading reST level.
README.rst: Add pypip.in downloads badge
README.rst: Add pypip.in latest version badge
README.rst: Add introduction section with description of project
README.rst: Add link to DB-API page
README.rst: Fix link
Merge branch 'master' into python3