Link to Wayback Diff

This commit adds support for linking to the Wayback diff view, rather
than linking to the before and after versions and asking users to be
able to determine the difference (which can be quite small).

Fixes #60

new version

Firefox Quit

It's important to explicitly quit the browser or else it hangs around
after diffengine has exited, which can start to hog resources after a
while.

added MANIFEST for including requirements.txt

updated

updated

v0.1.0 release

fingerprinting

Added a _fingerprint function that will take the summary text and bleach
out all html and remove all whitespace. The test for equality uses
this function to determine if the page content has changed. Hopefully this
will catch instances where whitespace is changing, and triggering an empty diff.

removed errant debug print

new version