Tap homebrew/science formulae to install OMERO via Homebrew

HDF5 formul has been recently moved to homebrew-science. Thus tapping this
repository is now required to install all of OMERO dependencies.
Merge pull request #1541 from sbesson/rebased/develop/hdf5_tap

Tap homebrew/science formulae to install OMERO via Homebrew (rebased onto develop)