Changes

Fix client Javadoc errors currently blocking the release
The server API depends on the client API. Therefore the client API 
Javadoc may not reference (via {@link ...}) the server API Javadoc as 
that creates a circular reference. Therefore, replace all {@link ...} 
references to the server API in the client API with {@code ...}
Signed-off-by: Mark Thomas <markt@apache.org>

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>

Fix duplicate plug-in definition
Signed-off-by: Mark Thomas <markt@apache.org>