Update guava to 15.0.
Merge pull request #1597 from bpindelski/rebased/develop/11480-remoting

Make BfPixelBufferTest run against a remote server. (rebased onto develop)
Update link to help.
Fix typo.
Update help link.
Update help link.
Update code to use guava 15.0.
Remove classes needed for legacy guava.
Update iface comments defining endianness.
Add logic to guarantee big-endian hash order.
Update Adler32 and CRC32 to use guava impl.
merge develop -D org -I include -E exclude: PR 1324 (Jython scripts (See #918))
merge develop -D org -I include -E exclude: PR 1359 (testGetTile() checks against getPlane(). See #11315)
merge develop -D org -I include -E exclude: PR 1385 (Update the OMERO VirtualBox image)
merge develop -D org -I include -E exclude: PR 1418 (Use Python 2.6 features unconditionally)
merge develop -D org -I include -E exclude: PR 1421 (Import as bug develop)
merge develop -D org -I include -E exclude: PR 1465 (Omeroweb examples fixes develop)
merge develop -D org -I include -E exclude: PR 1466 (plate_thumbs_11160_develop)
merge develop -D org -I include -E exclude: PR 1501 (10618 priv thumbs (rebased onto develop))
merge develop -D org -I include -E exclude: PR 1503 (Robot structure (rebased onto develop))