Kaleido

Fixed
- Fix for version 0.1.0 windows pip packages being unable to find the vendored kaleido executable [61](https://github.com/plotly/Kaleido/issues/61). Note: This fix is not needed by Mac or Linux pip packages, and it's not needed by conda packages on Mac, Linux, or Windows.

Added
- Added support for custom chromium arguments (https://github.com/plotly/Kaleido/pull/53)

Fixed
- Fixed standard error thread race condition (https://github.com/plotly/Kaleido/pull/52)
- Fixed memory leak (https://github.com/plotly/Kaleido/pull/43)

Changed
- A lot of build system and CI refactoring to support the new conda-forge pacakge.

Release candidate for 0.1.0. Based on branch https://github.com/plotly/Kaleido/pull/43

CREDITS.html update

Includes CREDITS.html in release artifacts

Alpha release including support for customizing chromium command line arguments: https://github.com/plotly/Kaleido/pull/53