1. Fixed delete label throw a exception issue.  "This request has been blocked because sensitive information could be disclosed to third party web sites when this is used in a GET request. To allow GET requests, set JsonRequestBehavior to AllowGet."

2. Fixed delete label not work in EntityFramework provider.

3. Rendering mistake on page editing.
Fixed can not delete the labels under categories.
daily build 4.4.0.0425
Merge branch 'master' of https://github.com/Kooboo/CMS
Fixed User key generation issue.
Build 4.4.0.0512
Fixed issue: “SlidingExpiration”必须大于等于“00:00:00”且小于等于“365.00:00:00”。
#269
merge #267 fix error in admin Ajax login function
Merge #266 Add allow-cross domain post switch
Merged #263 Azure startup task
Fixed 0 absolute expiration caching bug. "new DateTimeOffset(DateTime.MaxValue) will fail on any computer with a timezone that is behind UTC (negative offset)."
Build 4.4.0.515
Commit user is empty in html block inline editing.
Fixed exit inline edit button issue.
Fixed jqueryUI date picker styles issue on inline editing.
DONOT render the page link in HTML block in inline editing mode.
Build 4.4.0.0520
Correct the invalid page route message.
Make a different Tips value.