Update hprose for JavaScript

Removed corsSupport property of HproseHttpClient for JavaScript, because
it will use cors automaticly.
Removed setFlash property of HproseHttpClient for JavaScript, because it
will set flash smartly.
Added flashpath attribute for hprose.js script tag, for example:
<script type="text/javascript" src="hprose.js"
flashpath="/flash/"></script>, it will load hproseHttpRequest.swf from
/flash/hproseHttpRequest.swf automaticly when it is needed.
Modified some other codes.