Release v0.3

What's Changed

• [story/gh-30] Added button to admin interface to initiate tracking nu… by @jdamerow in #61
• [task/gh-34] made Redcap fields configurable in settings.py file by @jophals in #62
• [Story/gh-38] by @jophals in #58
• [task/gh-44] for confirmations: added handling of missing fields and … by @jophals in #63
• prepare release by @jdamerow in #66

Full Changelog: v0.2...v0.3