Merge pull request #36 from maurizi/fix/display-filters

New API for display filters
Fix README link to javascript docs

Update to organization change (azavea -> OpenTreeMap)
Update to correct file (filterStringToWhere.html -> filterObjectToWhere.html)
Use a different static provider (htmlpreview.github.io -> rawgithub.com)
Add settings.json to gitignore
Upgrade to latest patch version of Windshaft 0.13.x

Fixes issues building node-eio