Added stubs for four API routes to search data

Added four routes:
1) /api/:version/search/zip/:zip - etting the information about a
zipcode as of the most recent date we have
2) /api/:version/search/zip/:zip/daterange - getting the information
about a zipcode within a daterange
3) /api/:version/search/zip/:zipA/vs/:zipB - etting a comparison between
two zip codes using the most up to date info
4) /api/:version/search/zip/:zipA/vs/:zipB/daterange - getting a
comparison between two zip codes using a date range