Search: add a dropdown to the address input that shows recently viewed places

[joshi1983]

This will include:

• Create a database table called location_search_option seeded with a few options to demonstrate the concept
• Pass options data to a new datalist HTML element on the page. This should work in a seek as you type fashion.
• Since Safari doesn't support datalist well even in recent versions, implement a workaround. For details, see: http://stackoverflow.com/questions/27494084/html5-datalist-tag-is-not-populating-in-safari
• Brainstorm, design, and implement a way to store frequently used location search options by users.
• Create an API for retrieving location search options that takes the prefix entered by the user and returns a list of location search options that merges location_search_option data with the other data.