adds SavedSearch cursory implementation
saved searches returns iterator
simplifying the SavedSearch fifo
adds serializing/deserializing to savedSearches
restoring and persisting SavedSearches when app launches and pauses
don't store identical terms but move the term to the top
store search term when search is issued
storing term when item for dropdown is picked
*typos
changes SavedSearch to an singleton
Merge pull request #162 from mapzen/baldur/store-searches

Baldur/store searches