Calculate veer and wind direction

Currently only accurate to +-1.8 deg/m.

Fix planar wind speed reconstruction

There was a math error in the original planar wind speed reconstruction.
Fixing this error broke an assumption made earlier and required some
major changes. The description of the new solution is in the docstring
for camille.process.lidar.planar_windspeed.

Merge pull request equinor#155 from ErlendHaa/rolling-median

Add rolling median filter processor

Merge pull request equinor#80 from lightenup/fix-codacy-integration-i…

…n-travis

Checking if CODACY_PROJECT_TOKEN is set before running coverage report

output

Merge pull request equinor#39 from sveinung-r/bazefetcher_output

Bazefetcher output

Add PyPi badge to README

Bazefetcher source

Set version 0.0.2