Adding phpunit tests.

Replacing Backbone.php's home grown unit testing with phpunit tests.
Removed backbone test docs
Update readme.
Update readme.md
Update readme.md
Updates to blog example.
Updated readme
Added ModelTest and supporting code.
Updated ModelTest
Updates to tests
Update to tests.
MockDatabaseResults class
MockDatabase class
Update Model.class.php
Update Collection.class.php
Update Schema.class.php
ModelTest class
Removed JSON
Updated readme
Fixed fatal error in Schema