template variables for data layer selected
Insert layer vars into the template
Adds interaction info
Simplify, mirror how this works in tm1
Sets max-height
Top heading, better contrast
Stronger callout to data layer currently in play
Use margin to space
Move some stuff around and never hide template code editor on scroll
Bring back a help toggle and move interactive dropdown to the top of the editor
Merge branch 'master' into interaction-tab-help
Merge pull request #229 from mapbox/interaction-tab-help

Interaction tab help