update jackrabbit webdav lib to version 2.6.3
update to 2.6.4 (latest stable version)
bump to 2.6.4 for maven
Merge pull request #289 from LukeOwncloud/jackrabbit

update jackrabbit webdav lib to version 2.6.4
Added name to build.xml for ActionBarSherlock and fixed calls to git in Windows
Merge branch 'develop' into review_build_process