Moved contact import processing to rake task

User uploads spreadsheet via ImportContact#new where it is cached on the
server. Actual import works with rake task -- rake import:process.
Lowercase state search terms

When searching for a state:xx, lowercase search input before running the
synonym filter.
Infer US from state name.

Various import improvements including the ability to infer US state from
state name if country is blank.
Import numeric only keycodes

Some keycodes are numeric only. It was failing to gsub because they were
not strings. Made a small change to enable import.

Also cleaned up some import code.
Added Loy's iOS icons

Added iPhone/iPad apple icons to header and assets.