Added function to get ParameterListNode
Added helper functions for adding parameters
Added helper methods for modifying parameter
Cleanup notification for child insertions. Fixes double notification
Added a setTypeHint() method to ParameterNode.
Added an addParameter() method to FunctionTrait.
Added fluent, mutually exclusive setAbstract() and setFinal() methods to ClassNode. TODO: Add a white space node after the abstract and final tokens.
Merge branch 'master' of https://github.com/phenaproxima/pharborist