Update to current parent version

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Upgrade to the newest NAR version

This version supports execution in Eclipse starting with Luna.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
README: update Eclipse instructions

We now require Eclipse Luna or later.

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

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