fix issue #25
add nunjucks template file
Now using nunjucks!

**Broken:**
Main content no longer editable. Need to split input into constiuent
blocks and deal w/ independantly.

**Temp:**
Kit template (public/templates/kit.html) is a temp fix till nunjucks
templates for kits exists in mozilla/webmaker-kits
reduce layout thrashing by debouncing a little
seperated out main content into constituent parts
removing unused files
integrate activity search
s/Lisense/License/
add option to edit "Additional Resources"
fix for no preview before search
integrate activity search
add option to edit "Additional Resources"
Merge branch 'activity-search' of https://github.com/fuzzyfox/webmaker-kits-builder into fuzzyfox-activity-search