Added Mocha global variables for TDD style. Fixes #793.
Merge pull request #796 from goloroden/mocha-tdd

Added Mocha global variables for TDD style. Fixes #793.
Docs: Updated contributor guidelines
Build: Fix perf test to take median of three runs (fixes #781)
Merge pull request #803 from eslint/perftest

Build: Fix perf test to take median of three runs (fixes #781)