harmonize OSGeo-Contact Information

[fgdrf]

Right now, if the contact changes all rst documents have to be updated separately. As a result the documentation is not consistent.

Solution would be an additional osgeo_contact.rst site within the doc folder. This document should be included in the sponsors_osgeo.rst with the following directive:

.. include :: ../osgeo_contact.rst

I would suggest to replace the Email and Phone phrase by little images because it's not necessary to translate these.

[camerons]

Note: This issue relates to this page: ​http://live.osgeo.org/en/sponsors.html

[fgdrf]

created a new osgeo_contact.rst file that contains only one section. removed the parts from the sponsors_osgeo pages and included the new page.

[hamish]

please move the ML email addr from the owner field if you take ownership of a ticket so it doesn't get lost