Adds SSLPinningMode to AFURLConnectionOperation and defaultSSLPinMode to AFHTTPClient.
Fixes memory leak.
Gets rid of for loop to check if public key is present.
[Issue #715] Fixing warnings generated by earlier versions of Xcode (/cc Ignacio Rodrigo)

Minor reformatting
Merge branch 'stream_exhausted_fix' of https://github.com/aburgel/AFNetworking into aburgel-stream_exhausted_fix
Minor reformatting
Re-ordering NSURLConnectionDelegate method implementations
Marking connection parameter in connection:needNewBodyStream: as __unused
[Issue #719] Adding shouldUseCredentialStorage property to AFURLConnectionOperation /thanks Xihe Yu
Updating list of implemented NSURLConnectionDelegate method
Adding AFNetworking architecture diagram
Fixing link to diagram in README
Fixing center alignment
Update README.md
Use NSURL methods instead of CFURL functions

* Replace CFURLCopyUserName with -[NSURL user]
* Replace CFURLCopyPassword with -[NSURL password]
Rename the `username` variable to `user`
Merge pull request #743 from 0xced/NSURL-user-password

Use NSURL methods instead of CFURL functions
Fix race condition in UIImageView+AFNetworking
[Issue #751] Removing NSURLConnectionDataDelegate from AFURLConnectionOperation's declared protocols
Suppressing warning caused by AFHTTPBodyPart -hasBytesAvailable not having default condition in switch statement