Bouncerscript

Changed
* `schema_file` is now specified internally and should no longer be set in configuration

Added
- Added support for new locations for MSI installers

Fixed
- Bouncer products with multiple platforms that share paths (i.e. stubs) now
have both platforms properly populated.

Added
- Added new behavior `bouncer-locations` for `bouncerscript` to handle
- Add checks for locations during `bouncer-submission` phase

Added
- Added a SCOPES.md file in repo root to document the relevant scopes used in bouncerscript

Fixed
- Fixed `bouncer-submission` support for Firefox RC paths.

Added
- Add support for `bouncer-submission` data validations *before* and *after* bouncer API calls
- Add support for `bouncer-aliases` data validations *before* and *after* bouncer API calls
- more verbose logging

Fixed
- fixed coveralls and coverage back to 100%

Removed
- stopped using scriptworker event_loop fixture