Added an handler for NewRelic:
* implemented a test which verifies that the fallback handler handles records when the NewRelic PHP extension is not installes
* implemented the actual handler
updated the documentation
removed the logic for the fallback handler, its out of place, adapted the "test"
refactored the implementation of the NR handler and its test:
* the test now checks that if the extension is not loaded, an exception is thrown
* the test now mocks the new relic native functions
* moved some parameters as constants in the handler class
removed netbeans files committed by mistake
Merge remote-tracking branch 'odino/master'
CS fixes and set the default NewRelicHandler level to ERROR, refs #105