let consoleReporter support other reporters

[mason276752]

example:

npm install mocha-silent-reporter
mocha $YOUR_TEST --reporter mochawesome --reporter-options consoleReporter=mocha-silent-reporter

[DJ-Glock]

This can be very useful! For now we have to use mocha-multi-reporters to run mochawesome and another reporter in the same time.

[adamgruber]

This feels like an abuse of the consoleReporter option to run multiple reporters.