Trim user fixtures
This commit contains a couple of fixes for issues tracked on github and from sentry warnings.

* A new message, message_no_pii, has been added to contact_congress_letter and is used to strip any PII from display in congress letters. The new method is now used in the corresponding .html.haml file.
* Search model is in the process of being migrated to store more information about a user and their query as well as handle validation so some clutter can be removed from the controller.
White space removal
Merge branch 'clay_dev'