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
Squash most of parse_req into expandVar and expandUrl
Add missing regex boundaries
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