Performance improvements in status + added an option to not report tracked unmodified files if desired (which makes status much faster if you the caller doesn't care about knowing which files are tracked unmodified)
some cleanups in status
release 0.4.3
Merge branch 'develop'

Release 0.4.3:
  * More performance improvements in status.
  * Added an option to not report tracked unmodified files if desired (which
    makes status much faster if the caller doesn't care about knowing which
    files are tracked unmodified)