The caches.size metric is not available for every cache implementation.
If the metric is not available the ui should still show hits and misses.
This commit ignores errors for the cache size and will do no further
requests for this metric after an error occurred.

fixes #756

Setting a loglevel for logger names with spaces currently fails because
the servlet.InstanceProxyController messes with the encoding. With this
commit the path is correctly encoded before being forwarded.

fixes #755

fixes #753

fixes #738

also fix table styling in httptraces, auditevents and sessions

In order to do a relaease not waiting for Spring Cloud
Finchley.REALEASE move all depedent stuff into a seperate module which
can be excluded during build

fixes #728

This makes sure that the headers are written to the output stream
before the async dispatch. Otherwise we end up with strange NPEs
when flushing the buffer on writing the body.

fixes #715

..to gain more performance and reduce gc pressure

fixes #713

closes #713