Improve EGit.setup
Improve EGit.setup

- set default target platform to Neon
- remove Luna target platform
- use Jetty 9.2.13 for Neon and Mars
- use SWTBot snapshot version for Neon and Mars
- locate nested projects for EGit

Change-Id: I575160058ee4700d31b683a94d1477cd4d8f7a32
Signed-off-by: Matthias Sohn <446760a3fbea85cd5f8f4f5c3de304fe3a38014f@sap.com>
collaborative-modeling/egit,collaborative-modeling/egit