Fixed a potential security issue.
Removed google code upload from build script.
Added php 5.6 and hhvm to travis tests.
Merge branch '1.7' into 1.8

Conflicts:
	ChangeLog
	lib/Sabre/HTTP/Version.php
Merge branch '1.8'

Conflicts:
	.travis.yml
	ChangeLog
	build.xml
	lib/Sabre/DAV/Client.php
	lib/Sabre/HTTP/Version.php