Fixed diagnostic generator; added messages.
Implemented --help.
Style and comments.
Got rid of that cscript-breaking comma.
Addressed code review feedback.
Fixed up duplicate diagnostic.
Explicitly supply generic argument for 'compareValues'.
Merge branch 'master' into wontYouPleasePleaseHelpMe

Conflicts:
	src/compiler/commandLineParser.ts
	src/compiler/diagnosticInformationMap.generated.ts
	src/compiler/diagnosticMessages.json
Perform an explicit return just in case sys.exit fails.
Merge pull request #351 from Microsoft/wontYouPleasePleaseHelpMe

Support the '--help' compiler flag.