Milestone 2 (uuf6429#34)

* Improve error handling mechanism (uuf6429#30)

* Relocated exceptions, tweaked phpunit config, fixed tests
* Added exception handler, removed failure mode, fixed tests
* Added new exception
* Added exception handler unit tests
* Various minor improvements in tests

* uuf6429#31 - Error handling change cleanup (uuf6429#33)

* Various minor fixes

* Updated readme

* Test fixes.

Added AbstractConfigurableAction class and tests, fixed uuf6429#25 (u…

…uf6429#26)

Update README.md