Drymass

- feat: automatically extract meta data from QPImage/QPSeries data
(qpformat 0.4.0)
- fix: setting "dist border px" to 0 still removed objects from border
- fix: scikit-image methods could not be used for "binary threshold"
- fix: set "image fix phase offset" to True by default, otherwise
objects in the background cause a false offset
- improvement: optimize CLI plots
- docs:
- update tutorials with new CLI plots
- add tutorial for background correction (3)

- fix: extracted wrong phase image from SID4Bio data (qpformat 0.3.5)

- feat: ROI background correction supports masking of the
imaged object via the "amplitude mask sphere" and
"phase mask sphere" settings in the [bg] section.
- setup: support qpimage>=0.4.0
- tests: improve coverage
- docs: minor update (7)

- ci: automate PyPI release with travis-ci
- setup: bump versions of dependent packages

- docs: update of introduction and minor changes

- bump version because of regression fixed in qpformat 0.2.1
- feat: flush statistics file during writing