Fix port in example config

Make sure it matches the default port in the code.
Use JSON values for data-parsoid and data-mw

This ensures that both are valid JSON. Each incoming value is parsed &
serialized. Outgoing values are currently also parsed for ease of further
processing, but we might eventually want to add an optimization that avoids
this for faster reads, possibly by passing something like an Accept header.
Merge pull request #56 from gwicke/master

Improve statsd reports
Drop dead code
Drop unnecessary calls to checkResponse
Pass the (required) apiRes.rev directly
Disambiguate conditional