add test to cover relative path linked resources after redirect

Conflicts:
	test/history_test.coffee
add test for forms after redirect
bugfix: relative path linked resources should resolve relative to final url if request was redirected

Conflicts:
	lib/zombie/window.coffee
Merge branch 'master' into pr/454

Conflicts:
	src/zombie/window.coffee
	test/history_test.coffee
CHANGED load is now asynchronous just like wait
Use updateLocation not replaceEntry