Added core sqlnet files.
Added compliance tests for sqlnet.

Currently, sqlnet does not even come close to passing all of the compliance
tests for the DB-API2.0 acording to PEP249, but we will work towards this.
Adding packaging data.
Fixed small rollback() bug.

Now we manually create a new transaction on each rollback because
once a connection is rolledback is cannot be used again.
Updated the README with some relevant information.

Also switched it to restructured text.
Merge with branch 'develop'.

Merged develop into master for 0.1 release.