Support refrences like {request.paramns.domain} in urls for proxy handlers
Allow configuration of the Parsoid host

Fixes #48
Refactor per PR comments
Replace parseVariable and isVariable with expandVar
Add an example for sharing of response handlers via yaml refs

Also fully qualify all predicate paths, so that the request (and possibly
later parent responses) can be referenced too.
Squash most of parse_req into expandVar and expandUrl
Add missing regex boundaries
Merge pull request #53 from gwicke/yaml_spec_refs

Add an example for sharing of response handlers via yaml refs
Merge pull request #51 from gwicke/master

Set a default port for statsd & use strict mode in testUtil

Self-merge per discussion IRL
Merge pull request #49 from wikimedia/issue-48

Allow configuration of the Parsoid host
Merge pull request #52 from wikimedia/interpreter-expandVar

Support references like {request.paramns.domain} in urls for proxy handlers
Improve logging for HTML PUTs
More general logging improvements

- replace console.* with actual logger calls
- include the detailed level path in the logged object
- remove old & unused util.log method
Merge pull request #54 from gwicke/improve_logging

Improve logging
Use new node-txstatsd package for statsd logging

Our custom statsd logger didn't actually work properly. I didn't feel like
debugging it, so I extracted https://github.com/wikimedia/node-txstatsd from
OCG (which works) and plugged it into restbase. Along the way I also cleared
up the metric names slightly, and fixed a name clashs between the option
method & the internal _options property.