Various changes that make less assumptions about things#7

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samhsuqld wants to merge 7 commits intoztec:masterfrom

suaustralia:master

Commits on Dec 17, 2013

Improve filter
timwsuqld
committed

Commits on Feb 21, 2014

don't assume that the CN is right, look up the samaccountname so it's consistent with other parts of the code
timwsuqld
committed

Commits on Feb 26, 2014

Reduce warnings by checking if LDAP attributes exist
Alan Kingsley
committed

Commits on Mar 6, 2014

allow attribute deletion
timwsuqld
committed

Commits on Jun 23, 2014

Fix whitespace, remove outdated comment
Alan Kingsley
committed
Whitespace changes
Alan Kingsley
committed

Commits on Mar 19, 2015

Make it clear this is our fork, so we can composer lock versions
timwsuqld
committed