Xcode 6.1 crash log about KVO

[XiangqiTu]

Hi,man.Recently，i download your refreshView Code from a recommended website.
Hm，i am like it.But it has a little defect.

here is the crash log,hope these things are helpful for you .

Best regards!

2014-10-27 19:43:52.525 AAPullToRefreshDemo[44859:1455223] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException',
 reason: 'An instance 0x78f663e0 of class UIScrollView was deallocated while key value observers were still registered with it. 

*** First throw call stack:
(
    0   CoreFoundation                      0x01cc5946 __exceptionPreprocess + 182
    1   libobjc.A.dylib                     0x0194ea97 objc_exception_throw + 44
    2   CoreFoundation                      0x01cc586d +[NSException raise:format:] + 141
    3   Foundation                          0x0157f6d4 NSKVODeallocate + 379
    4   UIKit                               0x0038f59b -[UIView release] + 89
    5   libobjc.A.dylib                     0x01962eb1 objc_release + 65
    6   libobjc.A.dylib                     0x01963d32 _ZN12_GLOBAL__N_119AutoreleasePoolPage3popEPv + 586
    7   CoreFoundation                      0x01ba7678 _CFAutoreleasePoolPop + 24
    8   CoreFoundation                      0x01bde76e __CFRunLoopRun + 2270
    9   CoreFoundation                      0x01bddbcb CFRunLoopRunSpecific + 443
    10  CoreFoundation                      0x01bdd9fb CFRunLoopRunInMode + 123
    11  GraphicsServices                    0x0435c24f GSEventRunModal + 192
    12  GraphicsServices                    0x0435c08c GSEventRun + 104
    13  UIKit                               0x003258b6 UIApplicationMain + 1526
    14  AAPullToRefreshDemo                 0x00076a0d main + 141
    15  libdyld.dylib                       0x024dbac9 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

[XiangqiTu]

oh ,i am sorry that this bug is belong to AAPullToRefresh.And i solve it and push a comment About it.

[r-plus]

Okey, feel free to pull request.