PyPTV v0.3.0

• read_targets, write_targets is now in ptv.py
• we can read complex image file names but we write always simple target files f'cam_{id:d}.{frame:d}'
• bump_version can be used to update versions, use 'major', 'minor','patch'
• last patch is 0.3.0
• in parallel we updated test_cavity so take a look there