Changes

Ensuring that LICENSE/NOTICE shows up in META-INF

Ensuring client-api is a Bundle too.
+ Refactoring spec-version and bundle plugins to parent pom.
+ Ensuring client symbolic-name is unique to existing
 server symbolic-name, and that there's no dependency
 declared between them (in an OSGi sense)
Signed-off-by: Joakim Erdfelt <joakim.erdfelt@gmail.com>