Move HTML template array concatenation into its own function.

Gruntfile.coffee

@@ -50,7 +50,7 @@ module.exports = (grunt) ->
         parts.push switch part[1]
           when '$' then "E(`#{part[2]}`)"
           when '&' then "`#{part[2]}`.innerHTML"
-          when '@' then "`#{part[2]}`.map((x) -> x.innerHTML).join('')"
+          when '@' then "E.cat(`#{part[2]}`)"
           when '?'
             args = ['""', '""']
             for i in [0...2]

src/General/Globals.coffee

@@ -14,3 +14,8 @@ E = do ->
   fn = (x) ->
     str[x]
   (text) -> r.call text, regex, fn
+
+E.cat = (templates) ->
+  html = ''
+  html += x.innerHTML for x in templates
+  html