Use Hammer.js for Image-viewer panning on mobile devices
Include hammer.js and viewport.css in base_container.html
Adding Zoom buttons to top-left corner of viewport (same as PanoJs)
merge develop -Dorg -Ssuccess-only: PR 2435 (cpp: RTypesI: use static locals in place of duplicated globals)
merge develop -Dorg -Ssuccess-only: PR 2835 (Update OmeroPy/src/path.py)
merge develop -Dorg -Ssuccess-only: PR 2895 (Reload groups after users added/removed)
merge develop -Dorg -Ssuccess-only: PR 2902 (OmeroPy: src flake8 (I))
merge develop -Dorg -Ssuccess-only: PR 2905 (Renderings settings )
merge develop -Dorg -Ssuccess-only: PR 2909 (fix #11625: sanitize invalidly named FS paths)
merge develop -Dorg -Ssuccess-only: PR 2912 (Java8)
merge develop -Dorg -Ssuccess-only: PR 2916 (Add 2008ServerR2 support to DropBox (rebased onto develop))
merge develop -Dorg -Ssuccess-only: PR 2919 (fix #7240: provide disk usage count)
merge develop -Dorg -Ssuccess-only: PR 2926 (OmeroCpp: Glob test sources)
merge develop -Dorg -Ssuccess-only: PR 2927 (OmeroCpp: Glob example sources)
merge develop -Dorg -Ssuccess-only: PR 2939 (Jdk1.8)
merge develop -Dorg -Ssuccess-only: PR 2941 (Qa submit)
merge develop -Dorg -Ssuccess-only: PR 2943 (Tablet pan viewer)
merge develop -Dorg -Ssuccess-only: PR 2945 (Add a plugin for determining disk usage.)
merge develop -Dorg -Ssuccess-only: PR 2946 (Prev next web viewer)
merge develop -Dorg -Ssuccess-only: PR 2947 (Update develop submodules)