To do for OBStools

[paudetseis]

To do list for improvements to OBStools:

• Improve documentation, especially for the utils and plot functions of obstools.atacr
• Add more tests to improve code coverage
• Add new modules for OBS data processing (e.g., orientation of horizontal components, etc.)

[paudetseis]

Some more to-do for OBStools:

• Accept either StDb or obspy.inventory object (or seamlessly switch between them using StDb tools)
• Include selection of frequencies in application of transfer functions
• save seismograms in common data formats (e.g., hf5, SAC, etc.)

[paudetseis]

Some more to-do...

• Change optparse for argparse
• Change all Unix-formatted paths to agnostic Path object
• Include windows-os in Travis build