Improve tests to verify that changes_since_last_scan is being set correctly
Remove an unused param
Add a record list for all pages with a URI
Fix return type
Get the previous page scan (regardless of which site scan it was in)
use the correct default user/db names
Merge remote-tracking branch 'upstream/master' into changes_since_last_scan_test
Re-implement the uri_hash field and indexes for pages

Now that we need to index both the uri and the (uri, scans_id), it makes more sense to fully index the uri.  In order to do that, we need to store a hash of the URI.
index the uri_hash, not the uri
Merge pull request #32 from mfairchild365/changes_since_last_scan_test

Improve tests for the changes_since_last_scan field