* Test runner: Detect extra property in 'actual' but not in 'expected'.
Also update all expected.json where this would result in errors.
* Include rmExpected.js script in case it is needed again
* master:
Upgrade flow to 0.41
Throw error if new.target is used outside of a function (#402)
Fix watch command (#403)
Update yarn lock
Fix parsing of class properties (#351)
# Conflicts:
# src/parser/statement.js
# test/fixtures/experimental/class-constructor-call/illegal-key/options.json
Expanding on #150, this allows `unexpected()` to accept the expected token type instead of a message string.
This overload is then used in a couple more places (that independently implement a logic similar to `expect()`'s) to construct an `Unexpected token, expected FOO` message.
