Merge pull request #38 from dgsan/master

Cleaned up and added tests for collation support.
Tweaks to dataType documentation.

Improved formatting, documented `collation` option, and added some examples for dataTypes.
Support for Enum type in MySQL adapter. Requires patch to mainline JDB.

(See pull request: https://github.com/1602/jugglingdb/pull/296.)

After this there are several ways to use Enum with the adapter as shown in datatypes.test.js.