Version 0.3.0

Thanks to @MHC03 for bugfixes.

New features and enhancements

• New app: Euler's Method (#161)
• New widgets and panes: Player (#110), DiscretePlayer (#171), CrossSelector (#153)
• Spinner (spinner.gif)
• Compositional string reprs (#129)
• Add Param.widgets parameter to override default widgets (#172)
• Pipeline improvements (#145, etc.)
• Additional entry points for user commands (#176)
• Support calling from anaconda-project (#133)
• Improved docs

Bugfixes:

• Fix example packaging (#177)
• Various bugfixes and compatibility improvements (#126, #128, #132, #136, #141, #142, #150, #151, #154, etc.)

Compatibility changes

• Renamed Param expand options (#127)