Adds missing label status
Adds spec testing default status unselection

Checks that a user cannot unselect the default property of a status and
that the user can select the default property of a non-default status.
Prevent default selection for default status
Adds changelog entry
object-daddy: Use Gem instead of Git repository
Travis: only build feature/rails3 instead of all branches
Merge pull request #540 from opf/fix/use_object_daddy_gem

object-daddy: Use Gem instead of Git repository
Merge pull request #531 from opf/fix/unselect_default_work_package_status

[FIX] Unselect default work package status
noneSelection and noneElement in translation.
Adds changelog entry
fix bug when time_types is an empty array.

I do not know why it is this way, but this makes
the timelines.js code more robust and fixes the bug.
Merge pull request #539 from opf/fix/no_data_to_display
Merge pull request #538 from opf/fix/none_translation