The usocket path for ssh-agent should be configurable.
The following methods
  * setPreferredUSocketPath(String usocketPath),
  * getPreferredUSocketPath()
have been renamed as
  * setUSocketPath(String usocketPath)
  * getUSocketPath()
Version bumped to 0.0.9.
Merge branch 'usocket_path' into dev
Merge branch 'dev'