Report ModuleEvaluation Error if a module throws during evalution, eg

ModuleEvaluationError: 'dep error' in
loads/deperror loaded by
loads/main

Add simple test files for Module Evaluation Error

Reviewed: https://github.com/google/traceur-compiler/pull/1127

Fixes #1127
Fixes #1135, experimental options via node api.

Add test case

Review URL: https://github.com/google/traceur-compiler/pull/1136

Closes #1136.
Add Number polyfills

This adds the following ES6 Number functions/constants:

  MAX_SAFE_INTEGER
  MIN_SAFE_INTEGER
  EPSILON
  isFinite
  isInteger
  isNaN
  isSafeInteger