Merge pull request #6 from datamade/master

Front end prototype
Merge pull request #23 from datamade/master

Buncha updates
Merge pull request #24 from datamade/master

updates to add data setp
Merge pull request #26 from datamade/master

WIP framework for adding data sources, about and data formatting pages, validation
Merge pull request #33 from datamade/master

USA Spending, data sources and geographies info pages
hiding data source in step 3 when no data available for the selected geography