Feature/pr improvements from external

[IanMoroney]

After forking the project that Dorny created, I've accepted the PRs that were pending in that project too to further enhance the reporter.

The following PRs have been rolled in under this update:

• Report jest-junit testsuite errors as failures
• Update mocha-json usage instructions
• Update check title and remove icon
• Fix parsing of ESLint reports in jest-junit format