Pull Request for Issue#45 and other two other bugfix#53

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gebing wants to merge 2 commits intotinyeeliu:masterfrom

gebing:45_InvalidCacheWhenNetworkError

Commits on May 21, 2013

It has 3 major enhancement and bugfix for AbstractAjaxCallback.java:
gebing
committed
in function clear(), remove some reset operations on variables which have public getXXX() functions
gebing
committed