[WIP] Address Search and Crashes Filter

[clhenrick]

Work in progress. Proof of concept to help resolve #76

• Text input that allows a user to enter an address to search by
• Form submit geocodes text input
• Result read out to user, asks to filter by location
• Map displays marker of search result
• Map zooms & centers to search result
• Button click filters crashes by result with a buffer of n meters

[gregallensworth]

Dan and I agree, that this is a neat idea. Casting out a circle from an arbitrary address, does provide one view of what the client had wanted, separate from the "crashiest intersections" thing as well. I'm going to add to #76 some more specific bullet items.