Simplify incremental parsing by moving old source tree nodes before doing anything.
Fix interface.
Simplify parser initializer.
Simplify incremental code.
Always mark nodes and tokens that cross the edited range.
Slightly speed up marking by avoiding calling fullStart on so many nodes and tokens.
Simplify incremental parser.
Speed up incremental parser.
Make 'kind' non-enumerable.
Remove unused asserts.
Fixing check.
Simplify rewind points.
Merge pull request #1239 from Microsoft/incrementalParser

Change how the incremental parser works.