Set 'this' to the global object when running in node.js.

Fixes #589.
Fix rsvp at v 2.0.4, workaround Travis failure.

At v3.0, rsvp no longer contains lib/, so we fall over.
I opened https://github.com/tildeio/rsvp.js/issues/182.
and https://github.com/google/traceur-compiler/issues/618

TBR=johnjbarton

Review URL: https://github.com/google/traceur-compiler/pull/619

Closes #619.
Set option value to true for boolean options

Commander calls the callback function with undefined for boolean options so we need to make sure to pass true to setOption.

Fixes #612

Review URL: https://github.com/google/traceur-compiler/pull/613

Closes #613, closes #612.
Merge branch 'nodejsglobal' of git://github.com/TomiBelan/traceur-compiler into TomiBelan-nodejsglobal

Conflicts:
	bin/traceur.js
Node.js API support source maps