Update RAP Runtime bundle versions and package exports to 2.1.1
Update RAP build configuration to 2.1.1 Kepler SR1 RC2
Bug 387991 - RAP: Add language support for RAP specific messages

https://bugs.eclipse.org/bugs/show_bug.cgi?id=387991

Adds RWTMessages files for English and German languages.
Merge remote-tracking branch 'rap/streams/2.1-maintenance' into patches/2.1/bsiPatches
Updates inactive maven.eclipse.org to repo.eclipse.org