superset

It's been more than 6 weeks since the last release and a lot has taken place. Here's a list of the highlights:

• Huge javascript refactor, we now use npm for all dependencies, webpack, and linted the whole js codebase (thanks @williaster !). require syntax throughout and for the "dashboard" and "explore" views we much thinner templates, moving most of the UI/UX code to javascript
• Integrated javascript build process to travis-ci
• A better looking bootstrap template using material design and a lighter color scheme
• A SQL editor that will eventually allow a workflow to create views from there
• A new heatmap viz that uses canvas and therefore can scale to a lot of datapoints
• Better color management for visualization withc comprehensive helper functions
• Tons of bugfixes & polish!