Update README.rst
Merge commits from lecram/master.
Add Travis icon.
travis: Drop Python 3.2.
Fix test failure on Python 2.6
Fix test failure in Python 2.6
Fix Python 2.6 tests.
Use unittest2 on Python 2.6
Merge pull request #10 from methane/fix-travis-errors

Fix travis errors
Merge commits from lecram/master.
Change Travis-CI URLs: s/lecram/PyMySQL/.