Run formatters in nodejs runner

[macbre]

Instead of running results formatter in PhantomJS scope, run them on JSON results returned by PhantomJS "inner" script.

Needed for #10 and #12

--format is now an alias of --reporter (-R shortcut)

Subtasks

• move formatters "framework" to nodejs runner script
• migrate JSON reporter
• migrate TAP reporter
• migrate CSV reporter (using csv-string)
• migrate plain reporter

[kennydee]

Hi, This sounds awesome.
I test this for a few days now, but got some issue, probably due to our statsd/graphite implementation ...
Some of the graphite node comes randomly (only the upper for exemple), and metrics for some measures never show ... Phantomas seems to send them well, so that's why i think the issue is on our part. I keep digging on it. If anybody has similar issue, don't hesitate to tell me ;)

Thanks