PHP 5.6 should no longer be optional for sabredav 1.8
Lets see if we can add vobject 3 to the build matrix like this.
Missing fi;
Space
missing e.
Updated changelog.
Merge branch '1.8' of github.com:fruux/sabre-dav into 1.8
Merge branch '1.8' into 2.0

Conflicts:
	.travis.yml
	ChangeLog
Merge branch '2.0'
SabreDAV 2.0 is getting the vobject 3.3.0 upgrade.
Unlocking nodes after they have been deleted.

Fixes #487.
Testing hhvm.
Merge branch '2.0'

Conflicts:
	composer.json
The master branch needs the fixes from vobject 3.3.1
Fixing some claustrophobia.
Support for max-resource-size.

Also moved supported-collation-set and supported-calendar-data to the
plugin.
Support for carddav:supported-collation-set and max-resource-size.

Also moved supported-address-data to the carddav plugin.
Automatically converting vcards.
text/vcard is the new default content-type.
Fixed a few content-type related tests.