Support for JavascriptMVC-compatible EJS tags <%== and <%#

EJS parser in JavascriptMVC supports some special tags. This PR adds supports for these tags.

 - for raw (unescaped) output you can use tag <%== output %> (treats the same as <%= output %>)
 - adding comments with tag <%# Comment %> (Treats the same as the include statement: removes from temporary js content)