[Building Sakai] sprited portal

[Gonzalo Silverio]

Following suggestions I have made all the portal icons into one sprite for
all skins (SAK-23463 <https://jira.sakaiproject.org/browse/SAK-23463>).
 Still a bit more to do.

I just though I would let people know - if you notice weirdnesses clear
your cache.

Thanks.

- Gonzalo
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