IJHacker: set the current thread's context classloader in IJ.run()

This helps us initializing ImageJ2 contexts.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Merge branch 'master' of git://github.com/fiji/fiji
Mark all versions as -SNAPSHOT ones

Since we do change things from time to time, such as the pom.xml
files, we need to re-deploy pretty much all the projects. That is
only possible with either increased versions or -SNAPSHOT versions --
as noticed by faithful Jeannie Jenkins.

Since the changes are too minor to merit a new version, we rather
switch to -SNAPSHOT versions.

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