message: Fix Type Definitions for ILexingResult.
  Fixes
diff: @@ -52,7 +52,7 @@ export interface TokenConstructor extends Function {
  export interface ILexingResult {
  tokens:ISimpleTokenOrIToken[]
  - groups:{ [groupName:string]:ISimpleTokenOrIToken }
  + groups:{ [groupName:string]:ISimpleTokenOrIToken[] }
  errors:ILexingError[]
  }
  