Travel plans/management section added to speaker profile

[ddspringle]

It has been requested that we add a system that will allow speakers to indicate any travel plans they might have (city, state, country, arrival, departure) so that those seeking an on-site speaker can request speakers when they are in their neck of the woods.

Visibility should be controllable by the speaker (e.g. show/do not show) and travel plans should be easily maintainable by the speaker in their profile. This should also be included in the speaker sign-up form.

Visible travel plans should be searchable and be displayed in the speaker information and speaker profile areas.