Added Phing build file

- Includes ‘test’ target for running all PHPUnit tests
Added PHPUnit config file & empty SpeedierPressTest class
Changed stable version of PHPUnit (v3.7.@dev)

Ran composer install
Corrected bug with variable name
Enabled display of test result summary in Phing ‘test’ target
Updated SpeedierPress & added PluginRegistry

* Added PluginRegistry as a Singeton pattern to just handle the validation and registration of plugin objects.
* SpeedierPress now just creates the pluign object, passed to RPluginRegistry to register, then returns it.
* Added tests for all methods in SpeedierPress & PluginRegistry classes.
Made Base class abstract, as should be extended as either plugin of theme
Added Type namespace.

* This is to contain Plugin & Theme namespaces.
* Moved Pluign related classes into this new names page
* Updated all class references in src/ & tests/