rebased OmeroPy/src/path.py onto upstream version 5.2
path.py: walk: "errors" now defaults to "ignore", consistently with os.walk
path.py: listdir: added "unreadable_as_empty" kwarg
updated lib/licenses
added test module for custom modifications to path.py
Update webadmin_utils.py

http://trac.openmicroscopy.org.uk/ome/wiki/MilestoneDownloads has a big red sign stating "deprecated page", with a link to donwloads.o.org. Might as well direct users to downloads.o.org from the application in the first place.
cmake: Use embedded gtest from bioformats
Update webadmin_utils.py

Changed to http://downloads.openmicroscopy.org/latest/omero/ as per Andrew's suggestion.
Update develop submodules

Repository: openmicroscopy/openmicroscopy
Already up-to-date.

Repository: openmicroscopy/bioformats
Updating c6fa36a..0819d22
Previously merged:
  # PR 1306 ctrueden 'Add support for PrairieView version 5.2 datasets'
  # PR 1337 hflynn 'Update NIS elements viewer software link'
  # PR 1334 rleigh-dundee 'cpp: Windows fixes for embedded gtest'
  # PR 1311 melissalinkert 'Performance and position count fixes for ND2 (rebased onto develop)'
  # PR 1322 rleigh-dundee 'cpp: Add embedded gtest'
  # PR 1330 rleigh-dundee 'doc: Work with sphinx 1.2.3'
  # PR 1332 melissalinkert 'Revert "Update POM version numbers to 5.1.0-m1"'
  # PR 1329 sbesson 'Use ome.staging for Maven release deployment'

Repository: ome/scripts
Already up-to-date.

Repository: openmicroscopy/ome-documentation
Updating 4605edd..01a91b2
Previously merged:
  # PR 975 ximenesuk 'Expose upload_rm option in the documentation'
  # PR 981 hflynn 'Adding repo cloning to 'using git' guide'

Generated by OMERO-5.1-latest-submods#193 (http://ci.openmicroscopy.org/job/OMERO-5.1-latest-submods/193/)
Disable MTPixelDataTest for now

gh-3023 enabled unit tests for several OMERO components. Initial runs
of MTPixelDataTest passed on travis and on 2 different workstations.
Now, the NPE which was seen on one work station is "infecting" travis
as well. Disabling the test for now.
Merge pull request #3030 from joshmoore/disable-mt-pixel-test

Disable MTPixelDataTest for now
Merge pull request #3004 from kennethgillen/patch-1

Update webadmin_utils.py with downloads.o.org link instead of trac.o.org
Merge pull request #3018 from snoopycrimecop/develop/latest/submodules

Update develop submodules (esp. for gtest bump)
Merge pull request #3010 from rleigh-dundee/cpp-gtest

cmake: Use embedded gtest from bioformats
Merge pull request #2835 from simleo/update_path

Update OmeroPy/src/path.py