initial integration with iRODS www.irods.org
The used PHP API is hosted at https://code.renci.org/gf/project/irodsphp/
in order to use the ownCloud login credentials we use a login hook to grab uid and password and store it in the session.
The stored credentials will be used for and interactions with the iRODS server.

Within the config UI a check box can be used to enable the credential reuse.
checkbox in settings ui
test case for iRODS storage added
adding $backupGlobals = FALSE because iRODS is heavily using $GLOBALS
adding auth mode to ui and the url
- implement touch() to at least create a file which doesn't exist
- implement a work around for folder mtimes - irods doesn't provide updated mtimes
incorporate development branch of  ssh://irodsguest@code.renci.org/gitroot/irodsphp

Conflicts:
	.gitignore
 update .gitignore
update copy right
fixing / adding comments
Read configuratons for external filesystem test from a private place.

This will help not to accidentially push private data and enable testing on our ci server.
update to latest master
Merge pull request #4166 from owncloud/ext-fs-irods-stable5

Ext fs irods stable5