remove redundant html tags from components

Hi Seth,

I removed the redundant html tags as you suggested in the web_ui forum for my Freebase Searchwidget.
All modified examples run successfully after the modification. 

This is my first pull request, I hope I do it right :-/

Also:
"comment added about fancy_syntax renamed to polymer_expressions"
I did not actually change the code because I don't know why you fixed polymer to 0.5.5 and this change works only on later version.

Günter