new object hosting mechanism
big changes for new object hosting mechanism.

change shell Global object functions.
	1. delete defineClass()
	2. delete gc(). reprace java.lang.System.gc().
	3. delete Global.environment object. reprace properties().
	4. new function environment().

update help() message.

delete old object hosting mechanism.
	1. old annotations.
	2. change source code.
added new object hosting mechanism examples
add Slot.toString
changed to try out the new object hosting mechanism examples, and more
replace v8-benchmark to Octane-v2.0

change ant files
replace benchmarks
change ant files
clean up both source code and javadoc comment
add example parser demo