update page

* demos load from a combo
* update blockly to latest revision
* update blockly to latest svn revision 623
* disable autocomplete because of a bug with latest jquery[|ui]
* add a hide option to je:options to allow hiding a field
* use new jquery prop method
* style changes
* add onblockly loaded option, don't do the default linke behavior
* update eflang
* get var path and enumerate blocks added
* add list ops to blockly
* for each for objects