Add Geographical filtering

[dragonmantank]

Be able to filter people by geographical location

[martarf]

I'm starting to work on this issue (unless someone already started with it) and I have some questions about it:

1. The user's profile form will have new inputs for their country/state/city info
2. In order to do that, we need new fields in the users table with country_id, state_id and city and new tables with the possible country/states
3. Next to the tags-filter a "Location"-filter will be added
4. To make this filter work the info for "Location" should be added in the json returned by the api

Do we ask for country/state/city only? Or will we need an address too?
I've prepared a migration to populate the country and state tables but I believe this is not the best option. Maybe someone has a better idea of how to do this.

If I am missing something, please let me know.Thanks!