Merge pull request #455 from groovecoder/google-setting-context

getattr in case GA settings is missing
Use search backend for page autocomplete.

We now use haystack (and thus solr) to do pagename autocomplete.  This will provide increased performance and better result matching.  Before, we would only match on name__istartswith on pagename, but now we'll match substrings.  I am sure there is room for improvement here, but this should be better than it was.

Added migrations for the page app (convert_to_south) as well as a data migration that runs the update_index management command.

Fixes #76.
clean up south migrations