Support ARC

Add ARC support to primary classes include

* ASIAuthenticationDialog.h
* ASIAuthenticationDialog.m
* ASICacheDelegate.h
* ASIDataCompressor.h
* ASIDataCompressor.m
* ASIDataDecompressor.h
* ASIDataDecompressor.m
* ASIDownloadCache.h
* ASIDownloadCache.m
* ASIFormDataRequest.h
* ASIFormDataRequest.m
* ASIHTTPRequest.h
* ASIHTTPRequest.m
* ASIHTTPRequestConfig.h
* ASIHTTPRequestDelegate.h
* ASIInputStream.h
* ASIInputStream.m
* ASINetworkQueue.h
* ASINetworkQueue.m
* ASIProgressDelegate.h
* ASIWebPageRequest.h
* ASIWebPageRequest.m

not include 
* CloudFiles
* S3