Replace scaled bird's eye image with unscaled one

Loads and scales up the thumbnail image for the bird's eye view
in the first place (fast) - like it was before, but then requests
the image again with the right dimensions (might be slow, but
better quality).
Just added a space
Add wsgi.py for OMERO.web

Since Django 1.4 the wsgi.py has been included in all new Django
projects to ease integration with WSGI aware web servers.  Adding this
allows the alternative ways of deploying OMERO.web such as:
 * Gunicorn (http://gunicorn.org/)
 * uWSGI (http://uwsgi-docs.readthedocs.org/en/latest/)

As well as many others.  Static content serving is also supported in
multi-process mode with automatic restarts after changes.
automatically setting FORCE_SCRIPT_NAME and STATIC_URL
shrinking line
adding sendfile to the nginx sanza
web config cleanup
using rstrip
removing white spaces
unifying timeout
adding clearsessions to let admins clean out expired sessions
refactoring duplicates
removing unnecessary configuration
adding link to Django documentation
Use IconManager of the agent.
Create a new renderer for selection wizard.
Minor adjustments suggested by Mark
Remove unused import
Remove size limit for preview.
Limit preview to non big images.