[RJ-Server] Updated specification of RJ version to 2.0.0

Signed-off-by: Stephan Wahlbrink <sw@wahlbrink.eu>
[RJ-Services] Improved util to install R packages
  - Added check of library location
  - Added validation of package installation

Signed-off-by: Stephan Wahlbrink <sw@wahlbrink.eu>
[Mvn] Updated build configuration
  - Updated to Tycho-0.18
  - Changed spec of encoding
  - Removed workaround for license-feature

Signed-off-by: Stephan Wahlbrink <sw@wahlbrink.eu>
[RelEng] Fixed license url for features

Signed-off-by: Stephan Wahlbrink <sw@wahlbrink.eu>
Merged branch 'master' into 'r-1.2.x'

[Mvn] Updated build configuration
  - Updated to Tycho-0.18
  - Changed spec of encoding
  - Removed workaround for license-feature

[RelEng] Fixed license url for features

Signed-off-by: Stephan Wahlbrink <sw@wahlbrink.eu>