Added test for issue #18
Issue #18: Initial implementation of detecting calls to a class parent's implementation
Updated copyright daterange to 2009-2013
Merge branch 'master' into detector-refactor
Issue #18: Added support for multilevel class hierarchies

Refactored source code analysis to separate class PHPDCD_Analyser, for more flexible/scalable code analysis handling
Added tests for correct handling of function argument type hints
Added (failing) tests for handling parent:: calls
Added resolving of parent::method calls to correct class

Changed class hierarchy storage in PHPDCD_Analyser from parent->children mapping to child->parent mapping, which parent handling easier and getClassDescendants also more efficient.