Not duplicate function for caching tiles in review
Move VNC browser URLs to vncbrowser application
Add missing start pattern for VNC browser URL config
Move CATMAID URLs to catmaid application folder
Fix some styling issues in URL configuration
Make skeleton list data migration more friendly

On setups without skeleton lists, migration 0020 will now not ask a user if this
migration should be run and it won't try to get a super user reference. These
things will only be done if there are actually skeleton lists to migrate.
Make annotation data migration more friendly

This commit makes sure data migration 0019 isn't run if there are not class
instances. This is for instance the case on new installations.
Properly use ORM models in migration 0020

Using the models directly isn't safe, because these models could change in the
future.
Update h5py dependency to version 2.2.1

This is required, because there is no other version on PyPi anymore and some
modules of CATMAID depend on h5py.
Fix httplib monkey patching problem with Gevent >= 1.0

From v1.0 on, Gevent doesn't support monkey patching of httplib anymore.
CATMAID's example script to run a Gevent WSGI server, however, was still
expecting this to be possible. This commit fixes this.

Thanks to Mikhail Kandel for reporting.