support for define([], obj), cs closure in r.e

fixes #371
fixes #407
throw on missing node.js module

fixes #411
added __webpack_hash__

fixes #422
Allow to share hotUpdateCallback

fixes #423
1.3.4
fixes #426
1.3.5
fixed HMR bug
1.3.6
fixed copy bug
1.3.7
Merge remote-tracking branch 'origin/master' into optional-require-as-global

Conflicts:
	test/cases/parsing/extract-amd/index.js