New icon.

Credit: http://en.wikipedia.org/wiki/Telephone_switchboard#mediaviewer/File:Offutt_Air_Force_Base_operator.jpg

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extra : amend_source : e03159b8d062265fd22ad3c457af98e09e24e29b
Compatibility with Odoo 8.0.
Added tag 3.0 for changeset a46eae881838