FELIX-3888 Expose the internals of ScrCommand as an (optional) service.  Also some cleanup and add aries version-checker

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1442007 13f79535-47bb-0310-9956-ffa450edef68
FELIX-3888 change maven version to 1.7-SNAPSHOT so aries version checker is happy and bundle version matches maven version

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1442008 13f79535-47bb-0310-9956-ffa450edef68
FELIX-3888 change ScrInfo interface style to use single PrintWriter for normal output and throw IllegalArgumentException for problems

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1442009 13f79535-47bb-0310-9956-ffa450edef68