Add file explaining toml-test.py's use and purpose

Try to avoid confusion like what arose in #12
Minor upgrade to toml-test.py #12

Don't use type="array" for arrays of tables
Make the test script work in both python2 and python3
The parser should now pass the test suite.

Except for that one silly test which forbids [ in table names
Removed a print statement. (Best debugging tool ever)
Actually fixes unicode issues Fix #12
Puts the elements of an array in table in the proper order
Doesn't overwrite old elements of nested arrays of tables with new
elements