Updater: Changed JSch dependency to 0.1.49

Fixed passphrase authentication.
Merge branch 'master' of https://github.com/stehel/imagej

This fixes the Fiji bug reported in

	http://fiji.sc/bugzilla/show_bug.cgi?id=553

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>