initial mocking of an http request

This is a simple mock that returns the expected html of the page to test
the downloader against. For now, the only tested property is the title
found in the html.
stop jsdom from hanging the entire test system

The window must be closed because otherwise the test suite never ends
itself.

Also, jsdom is really slow and is overkill for a task like "extract the
<title> of an html document". It's probably even slower inside a
browser's javascript environment, but I haven't tested that yet.
Merge branch 'basic-http-mocking' into master
version bump to: v0.0.3

Hooray! HTTP mocking.