Re-enabled RenderAnimateTrees. Fixes issue 1101: http://goo.gl/YIvqSY
Merge branch 'master' of github.com:singularity-viewer/SingularityViewer
Make ubuntu cmake hack do yes up go now
Increased in Preferences > Graphics the maximum value for the Objects LOD slider from 2 to 4 and for the Trees LOD slider from 1 to 2
Reverted Objects LOD slider max value to 2 and fixed presets values for the Trees LOD slider according to the new maximum
Crash fix for empty media URL.

Apparently LLViewerMediaImpl::navigateInternal could be called with
an empty url. That lead to a curl request with an empty url, which
failed because that leads to an empty 'service' string, which is
not allowed.

Patched the code to ignore empty media urls and hardened AICurl
to deal with any remaining cases.
Avoid long viewer freezes when region doesn't have reverse DNS.

Some opensim servers might not have a reverse DNS, which causes
a stall of up to 5 seconds for each call. This means that
every time you up the parcel music stream (or any other media)
the viewer would freeze six times 5 seconds.. 30 seconds.

With this patch it only freeze once ;) (when you enter a region).
It already did that before (too), but after that opening the
parcel media doesn't freeze the viewer at all anymore.
Merge remote-tracking branch 'singu/master'
Merge branch 'master' of git://github.com/LightDrake/SingularityViewer