Replace grunt with gulp
Add gitignore file
Add a new filterForm element; Refactor the navigation element so that both navigation and filterForm extend a common base element View (FilterElementView)

 re #61
Style the FilterForm element; some minor fixes; build dataseed visualisation assets

 re #61
Add alternate visualisation backend "Highcharts"

re #159
Disable Highcharts animation
Add highcharts bubble and fix spin.js loader
Add highcharts line and column charts
Add measure label to Highcharts bubble chart
Merge branch '159', add Highcharts integration

re #159
Fix loading view for non-chart elements

re #159
Fix typo in dataseed element render method
Add Jasmine test runner for dataseed and example test
Fix dataseed-visualisation packaging config
Move highcharts bar labels inside
Don't render highcharts bar labels when bars are too small

re #159
fix selectRow event handler
Add hierarchical drill down support to the filterForm element

re #63
Add sort option to the filter dimension

re #61
Move hierarchical dimensions handling logic within visualisation model and view

re #63