version to 0.27.0

* remove `partial` method from view handlers and runners #129
* runners: have base runner take args and set its readers #130
* runners: remove `app_settings` reader from the runners #131
* runners: add a `DeasRunner` to eventually replace the sinatra runner #132
* runners: update sinatra runner to take args #133
* route handling cleanups #134
* pass standard args in to the sinatra runner #135
* minor cleanups/reorgs to runner implementations to prep for render
  changes (82c9c0a01f19e139c73ee610f11a5bc7c5671aa8)
* don't add an underscore to a partial's basename if has one already #136
* set render layout opt only if it is missing from given opts #137

/cc @jcredding