Add support for building OMERO with Ice 3.5 using Homebrew
Use Homebrew ice (currently 3.5) as the default formula
Set SLICEPATH in the superenv if using Ice 3.5
Remove symlinking of Ice Python libraries
Update formulas to 5.0.0-rc1
Revert version number patching
Merge pull request #47 from sbesson/ice35

OMERO: add support for Ice 3.5