Invert order of brew install omero and omero_homebrew.sh

With the recent modifications in homebrew-alt, most dependencies should be handled in the OMERO formula.
Remove Homebrew dependencies from omero_homebrew.sh

With recent changes to the OMERO formula, the pure Homebrew dependency are
directly handled by Homebrew. This script should still check and install the
Python dependencies of OMERO.
Convert deprecated omero_homebrew.sh into python_deps.sh
Strip remaining Homebrew components from python_deps.sh

Update OMERO-homebrew-install to use correct location for dependencies
Add method to retrieve given annotation linked to object.

Method useful to retrieve annotation like modulo annotation
added at import time.
Fix class cast exception.
Fix query to load annotations.
Add tests for modulo retrieval.
Add modulo namespace to constant.
Add test to create XML annotation.
Add modulo ns to pojos and add test using modulo ns.
Fix documentation.
Add pixels to the list of supported type. Test added too
Improve Java doc.
Add notes about Python package dependencies (Scipy, PyTables)
Add note about the expected current directory
Check for local bin/pip installation before looking in the PATH
Update submodules
Merge pull request #785 from snoopycrimecop/merge/dev_4_4/submodules

Update submodules (dev_4_4)
Merge pull request #764 from sbesson/homebrew_deps

OMERO homebrew dependencies