teams/expeditions support (and other things)

[dmitry]

We finally added team/expedition support.
This should make it easier for groups of people to organize
expeditions. The individual contributers still work the same.
It's still a bit rough on the edges, but functionality works, if there
are any bugs found, please let us know.

So here is how it works:
* the user goes to the "profile" page
* the user, that is putting together an event, selects "I'm a team
captain" check box.
* the team captain creates new teams and expeditions
* the team captain has to add a team (or multiple teams) to a specific
expedition.
* a regular user can join or leave teams created by the captain. At
this point the user has to know what team to join, so the team captain
should let his people know what is his team name (which is a unique
field in a database, so there should no be naming collisions), then
the users can join it using auto-completion field.
* once all this done, during posting a new story there will be a drop
down box available of the upcoming expeditions available for the teams
the user is a member of. Choosing an item from the dropdown will
automatically fill in the story's date and the location based on the
expedition info.
* eventually teams/expeditions stats will be added to the main page to
make things more interesting.

All this is very basic stuff, please make suggestions what works, what
does not -- that's is the only way we can make it better.


We also added support for uploading multiple pictures per story.
Unfortunately had to abandon nice and clean layout on the home page,
since it only supported a one picture per story. If anybody has any
ideas or suggestions how to improve it, let's have a discussion. In
order to keep things more consistent with the best practices (restful
mainly) the story create/edit use cases were redesigned a bit as well,
we got rid of "in place edit" fields (they are cool, but arguably more
standard web components should be used to avoid confusion -- we've had
way to many people asking how to edit story information, so the "in
place edit" fields are replaced with the simple "Edit Story" link).