Bug fix for ticket search by state.

The data that was being passed to the options_for_select form helper
was failing in the case of the "in_progress" state. For that state, the
form helper was using "in progress", but the data in the db was stored as
"in_progress". To fix this, I switched to the multi-dim array version of
options_for_select in which each sub array possesses a "value" value and
a more user friendly user facing corresponding value.
Adds some simple default ticket filters.

The tickets view now has 4 built-in filters for quickly selecting a
sub-set of tickets to be displayed. You can now easily filter by:

  * Your open tickets
  * Your in progress tickets
  * Your group's open tickets
  * Your group's in progress tickets

The last two will only display if the user is a member of a group.