Build System: support building of Bundle Fragments
Needed for #245 (closed).
About Bundle Fragments: https://www.ibm.com/support/knowledgecenter/SSRTLW_9.5.0/com.ibm.aries.osgi.doc/topics/cbundlefragment.html
Needed for #245 (closed).
About Bundle Fragments: https://www.ibm.com/support/knowledgecenter/SSRTLW_9.5.0/com.ibm.aries.osgi.doc/topics/cbundlefragment.html