Changed Block's Switch/Case into If/Else

Usually If/Else is [about the same](http://jsperf.com/if-switch-123/3) or [faster than Switch/Case](http://jsperf.com/if-switch/4).  I also re-ordered the possibilities from most likely to maybe least likely (not sure about if Partials are used more than NoEscape, & I assume people use comments more than either).

I did not test output, but should be OK since I mostly copy/paste.  Let me know if this does not work for you!
cheers