Put semantically relevant tokens in the tree.
Traverse into all nodes when walking the tree.
Put semantically relevant tokens in the tree.
Simplifying the signature parsing code.
Use helper function.

Rename some functions to be clearer.
Simplify code.
Simplify parsing code.
Make 'CatchClause' have-a block, instead of be-a block.
Remove arrow allocations from the parser in a few places.
Reduce arrow function allocations in the parser.
Merge pull request #1334 from Microsoft/tokens

Tokens