[MERGE] Add specification for colocated-branches

[Jelmer Vernooij]

The attached patch adds the co-located branches specification to
doc/developer. The fact that this is a merge request should make it a
bit easier to track its status. 

Cheers,

Jelmer
-- 
Jelmer Vernooij <jelmer at samba.org> - http://samba.org/~jelmer/
Jabber: jelmer at jabber.fsfe.org
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