Adds SSLPinningMode to AFURLConnectionOperation and defaultSSLPinMode to AFHTTPClient.
Fixes memory leak.
Gets rid of for loop to check if public key is present.
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
Merge branch 'master' of github.com:AFNetworking/AFNetworking
Merge pull request #747 from peymano/race-condition-fix-in-uiimageview

Fix race condition in UIImageView+AFNetworking
Enqueuing operation in upload example rather than calling -start directly
Whitespace formatting
Using early return in AFURLConnectionOperation -setState: to avoid posting notifications in lock
[Issue #737] Updating default Accept-Language header value in AFHTTPClient
Whitespace formatting by Xcode re-indentation