Refactor views by creating layouts for shared elements

The search aside and info screen were being used in multiple views/partials so I moved them into a separate partial.

Changed site title from "Human Services Finder" to "OhanaSMC"

Added tests to make sure the search aside appears and is functional from the search results page, the organizations index page, and the details page. Also added tests for home page text and title.
Search radius persists across the session. Fixes #34

The search radius selection from the dropdown is now stored in a session variable (after the form is submitted) so that it is remembered in all views that display the radius dropdown.