[Build] prepare new development version 0.7.1-SNAPSHOT

Change-Id: I03814a9cb5b60b5b5490d52e905923509070d034
[Java] fix synchronization bug in proxy invocation handler

access to connector status and queued requests was not properly
synchronized

Change-Id: I9214c53fdb6d24354b9209d5fca43fdc1ff5a870
[Release] prepare release 0.7.1

Change-Id: I3292692d8ff4ecabfb9bb3cea33cb62de844dc0a
Merge branch 'bugfix'

Change-Id: I799d95be8969c63f9c6eb223880e4eaecf43d9d3