Add travis config to test on sqlite, postgres, mysql
Drop all tables of db after each test
Reduce complexity of __getitem__ API

If you need to specify more, call get_table method
Fix test to ignore order of columns
Use OrderedDict on insert for value order comparison
Treat columns as ordered throughout code

The set() does not make anything any easier,
lists are closer to underlying representation.
Make print a function in documentation
Add ordereddict to Py 2.6 special dependencies
Fix bad python 2.6 detection
Reduce default String length of pk to 255
Add Travis CI build status to README

[skip ci]