Created clearer doc comments for the Use*Node classes.
Change statement to declaration
Merge pull request #132 from grom358/use_docs

Created clearer doc comments for the Use*Node classes.
Allowed Node::replaceWith() to accept a callable.
Merge pull request #134 from grom358/replaceWith_callable

Allow Node::replaceWith() to accept a callable.
Upgrade to phpunit 4.2
Merge pull request #137 from grom358/phpunit-42

Upgrade to phpunit 4.2
Renamed fromScalar to fromValue and getValue to toValue
Removed toBoolean
Update for removal of toBoolean
Created a basic config file for Doxygen.
Dropped Doxygen support in favor of ApiGen.
Documented a lot of stuff.
Wrote more class-level documentation.
Deleted a bit of junk I accidentally committed.
ParameterTrait -> Pharborist\Functions\ParameterTrait
ArgumentTrait -> Pharborist\Functions\ArgumentTrait
FunctionTrait -> Pharborist\Functions\FunctionTrait
AnonymousFunctionNode -> Pharborist\Functions\AnonymousFunctionNode
CallNode -> Pharborist\Functions\CallNode