built the initial structure for extracting the drilldown logic into its own module
Merge branch 'develop' of https://github.com/splunk/splunk-heatwave-viz into develop
first drilldown module prototype finished. It requires the user to specify a hidden search question in order to be able to drilldown when clicking on a bucket or field
Merge branch 'develop' of https://github.com/splunk/splunk-heatwave-viz into develop