Initial conversion to PHP 5.2

Obvious changes:

* Removed all Traits
* Created a base object from which all inherit: TinCanAPI_Object
* Prefixed all objects with TinCanAPI_ to compensate for lack of namespaces
* Created a custom autoloader to be required for TinCanAPI projects.

See sample/index.php for a working example.
Merge pull request #19 from rheinardkorf/PHP_5_2

Initial conversion to PHP 5.2