Prepare Jaybird 6.0.6 development

Author: mrotteveel

build.properties

@@ -1,7 +1,7 @@
 version.major=6
 version.minor=0
-version.revision=5
+version.revision=6
 # version.tag should start with a dash (-) unless it is empty
-version.tag=
+version.tag=-SNAPSHOT
 # This must be set to the git tag for a release, otherwise to the branch
-version.svntag=v6.0.5
+version.svntag=Branch_6_0