Added DateTime::hasTime
Bumped version.
Added Property::getValue()
Added a Document class.
Added a Document class.
Merge branch '2.1'

Conflicts:
	ChangeLog
	lib/Sabre/VObject/Component/VCalendar.php
	lib/Sabre/VObject/Document.php
	lib/Sabre/VObject/Property.php
	lib/Sabre/VObject/Property/DateTime.php
	lib/Sabre/VObject/Property/MultiDateTime.php
	lib/Sabre/VObject/Version.php
	lib/Sabre/VObject/includes.php
	tests/Sabre/VObject/DocumentTest.php
	tests/Sabre/VObject/Property/MultiDateTimeTest.php
Making the test work again.