Prepare Jaybird 5.0.6 release

Author: mrotteveel

build.properties

@@ -2,6 +2,6 @@ version.major=5
 version.minor=0
 version.revision=6
 # version.tag should start with a dash (-) unless it is empty
-version.tag=-SNAPSHOT
+version.tag=
 # This must be set to the git tag for a release, otherwise to the branch
-version.svntag=Branch_5_0
+version.svntag=v5.0.6