Add command line option --referrer <name>, sets System.referrer for --out files.

Rename ModuleTransformer .referrerName to .moduleName.
Pass traceur.options through to inlineAndCompile().
Use the IIFE argument to modules.js to set global (window or node global).
Add a handy Makefile rule test/unit/%-run to run one test.
Move registerModule into System.

Review URL: https://github.com/google/traceur-compiler/pull/642

Closes #642.