Add retry option

[gsvr]

When the user reaches the last page of address options displayed, the n. Next option should be replaced by r. Retry, which should take the user back to entering their address. This will help users that misspelled their address or didn't specify enough information and need to do another search. See https://github.com/praekelt/go-jsbox-location/commit/fb4b031d4a02c5dd58dfc9929180eb6fd7d9d4bc for an example.

[hodgestar]

This would involve:

• Adding a retry_text option that defaults to null.
• If retry_text is not null, display a retry option.
• If retry is selected, call return to the internal search state.