[API] Added IResource.refreshLocal() method

This patch also includes the Eclipse implementation of this method.

Change-Id: I787cece9bedda741fe30e76286b6098bc7f6a5d3
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1455
Tested-by: Jenkins CI
Reviewed-by: Arsenij Solovjev <xeper000@gmail.com>
Reviewed-by: Martin Wichner <martin.wichner@googlemail.com>
Reviewed-by: Franz Zieris <zieris@inf.fu-berlin.de>