Luna target platform

Change-Id: Ic883738f2c50050dfc44fed1f105a42169fb0986
Tycho 0.21.0

Change-Id: Ibd49679ca70060a316eabaf96d923aa0d22a3470
proposals for non-final variables in Xbase 2.6.0

https://www.eclipse.org/forums/index.php/t/796283/

Change-Id: I02c5367cde8c3ef35c54a451125a8a2ec11086e9
injected objects can be extensions

Closes #23

Change-Id: Ia395c4d9ebb0fc2c9da52df9e24c0c128483fe80