Track if the parser encountered any errors as a bit in the next node that is produced.
Provide utility function to report back if a node contained a parse error anywhere inside of it.
Merge branch 'master' into parserErrors2

Conflicts:
	src/compiler/parser.ts
Merge branch 'master' into parserErrors2
Merge pull request #1369 from Microsoft/parserErrors2

Track if the parser encountered any errors as a bit in the next node that is produced.