- Rename config variables to be more intuitive, split up upload-to-factorcode? into several variables
- Add target-variant variable. This allows running multiple masons on the same architecture but with different parameters, for example bootstrapping with SSE disabled, or simply for testing on a different OS release.
- Added a boot-flags variable for use with the above
- add heartbeats for eventual notification of when build machines go down
- mason.version: replaces mason.release, builds source package automatically, and tweets when new versions released
- webapps.mason: new downloads action includes automatically-generated source download and release announcement links