[HttpUrlValidator] allow more special characters.
[EventPresenter] Better presentation of all-day dates.
[README] updated the readme file and switched it to use markdown instead of rdoc format.
Merge branch 'master' into democracy
democracy: [Candidate] distinguish between `running` and `not_running`.
democracy: misc cleanup.

Don’t use item_type and item_id parameters for contacts — the controller should only be called under an item (such as a Candidate or Person).

Test the handling of private contacts.

Don’t have external links on People, for now.
[Tag] remove validation of item.

It was interfering with the creation of tags as nested items under other objects being created.
adjust plain time format and fix event datetime display.
Merge branch 'master' into democracy

Conflicts:
	spec/models/tag_spec.rb
democracy: [BallotsController] fix internal links in index view.
democracy: [Candidate] default scope to order by name.