Updated copyright years.
Updated link to license.
Removed docs from README.md
Some cleanups.
Bumped version
Fix for #94.
Removing unsupported travis php versions.
Merge branch '2.1' into 3.1

Conflicts:
	.gitignore
	.travis.yml
	ChangeLog
	README.md
	lib/Sabre/VObject/Component.php
	lib/Sabre/VObject/Node.php
	lib/Sabre/VObject/Parameter.php
	lib/Sabre/VObject/Property.php
	lib/Sabre/VObject/Property/Compound.php
	lib/Sabre/VObject/Property/DateTime.php
	lib/Sabre/VObject/Property/MultiDateTime.php
	lib/Sabre/VObject/RecurrenceIterator.php
	lib/Sabre/VObject/Version.php
Altertered test so it doesn't fail on PHP 5.5.12.
Fixed two unittests.
Bumped version.