making iterating in handlebars suck less

gistfile1.coffee

# Used like this:
#   {{#foreach "zone" in data.availability_zones}}
#     <th>{{zone}}</th>
#   {{/foreach}}

Handlebars.registerHelper "foreach", (keyword, blah, collection, ctx) ->
  buffer = ""
  copy = _.clone(this)
  _.each collection, (i) ->
    copy[keyword] = i
    buffer += ctx.fn(copy)
  buffer