Remove faye-websocket workaround
Formatter customization via Konacha.config

Fixes #137
Avoid stubbing STDOUT.puts

For some reason this causes problems with Poltergeist 1.3.
Suppress JS errors in Poltergeist

This should be handled by visionmedia/mocha#868, but
PhantomJS probably still has a version of WebKit with
https://bugs.webkit.org/show_bug.cgi?id=67119
Revert "When the runner starts, copy Mocha's global error handler onto each iframe. Remove it when the runner ends. Fixes #136."

This reverts commit 39379f100728ff637e0029a1a279b407a2e750fc.
Pass iframe errors up to the parent error handler (if there is one).
Merge branch 'master' into bug-136-async-errors