Fix testImporters.py.

Among other things, use a temporary in-memory SQLite database for testing.
Add tests for ica.se plugin
Fix buglet discovered due to tests
Add tests for foodnetwork plugin
Buglet found with tests and som whitespace triming in foodnetwork plugin
Move foodnetwork and ica.se importer tests to gourmet/test/.
Remove some obsolete imports from gourmet/importers/html_importer.py.
Small fix, mainly for future BeautifulSoup4 compliance.
Small fix for more a expressive test result.