Add missing entry for plugin.properties in build.properties
Add missing entry for plugin.properties in build.properties

Change-Id: I4eddecf92cde2605236ef103102f351f351213a5
Signed-off-by: David Pursehouse <b162584c9d065018308db99337b5a9fbc8680008@gmail.com>

collaborative-modeling/egit,collaborative-modeling/egit