release 0.2.0

Changelog:
* update to http-proxy@1.1.x; http-proxy@1.0 was a "from-scratch" implementation of
  the proxy core by nodejitsu, leaving http-proxy@0.x no longer supported

* implements support for use as grunt middleware;
  includes examples for running a proxy url inside `grunt serve`
  see https://github.com/gruntjs/grunt-contrib-connect/pull/85

* implements support for proxying to SSL/TLS endpoints

* implements support for connecting to HTTP proxy gateways on the
  LAN that require basic authentication credentials

* general housekeeping: added unit tests, resolved jshint issues