Fix typo in method name

Drop support for false return value in NodeTraverser

Throw if NodeVisitor returns invalid value

Throw on nested array in NodeTraverser

The AST never uses deeply nested arrays, so don't support this in
the node traverser. Throw an exception instead.

Implement NodeTraverser::STOP_TRAVERSAL

Conflicts:
lib/PhpParser/NodeVisitor.php

Cleanup imports

Thanks PhpStorm :)

Remove support for node cloning in traverser

Don't use deprecated getMock()

Add sanity check for leaveNode() return value

Disable cloning in traverser by default

#184 Add a flag to NodeTraverser to avoid cloning nodes

Rename nodes for compat with PHP 7

The old names will still be available on PHP 5.x.

Cover both DONT_TRAVERSE_CHILDREN cases

Add NodeTraverser::DONT_TRAVERSE_CHILDREN support

Port library to use namespaces, with BC for old names