Fix for scala library not resolvable in Servicemix Version.

Hi, 

with Active MQ 5.9.0 and 5.10-SNAPSHOT I was encountering a problem when I tried to install the activemq-blueprint feature into a Karaf 2.3.3 container. 

The error message was 
Error executing command: URL [mvn:org.apache.servicemix.bundles/org.apache.servicemix.bundles.scala-library/2.9.1_3] could not be resolved

My container was able to resolve all other bundles from maven central, this was the only one failing. I made the changes in this pull request and the feature was installing fine and I was able to create a broker and use it. 

Best regards
Andreas