[Issue #737] Updating default Accept-Language header value in AFHTTPClient
Fixing @param name to correspond to actual parameter (filename -> fileName)
Fixing warning caused by default statement in switch statement that covered all enumeration values
Revert "Fixing warning caused by default statement in switch statement that covered all enumeration values"

This reverts commit b5c48f13a1d42952da78ab3027b7d804048f525b.
Fix  [Issue #751]
Serialize calls to responseJSON using a lock.

AFJSONRequestOperation's completion path calls `responseJSON` from a
processing queue.  Because `responseJSON` "lazily" deserializes the
response data into a JSON object, it needs to be protected against
concurrent access from other queues (threads).

For example, `AFNetworkingOperationDidFinishNotification` is posted
when the operation finishes but perhaps before that processing queue
has finishing executing.  Notification observers who also access
`responseJSON` end up in a race with that queue that often leads to a
crash.

We reuse the existing lock from our AFURLConnectionOperation base
class.
[Issue #769] Resolving asymmetry in cached image case for UIImageView category
Updating OS X project settings
Merge pull request #768 from jparise/response-json-lock

Serialize calls to responseJSON using a lock.
Cleaning up formatting from pull request

Adding @dynamic for lock property
Merge branch 'master' of https://github.com/Fl0p/AFNetworking into Fl0p-master
[Issue #767] Consolidating macros
Wrapping AFHTTPBodyPart switch statement with #pragma to ignore -Wcovered-switch-default
Fixes warning: multiple methods named 'postNotificationName:object:' found [-Wstrict-selector-match]
Fixes warning: multiple methods named 'objectForKey:' found [-Wstrict-selector-match]
Fixes warning: weak receiver may be unpredictably set to nil [-Wreceiver-is-weak]

Signed-off-by: Mattt Thompson <m@mattt.me>
Compare NSURLRequest rather than NSURL

If you inadvertently load a nil URL in UIImageView+AFNetworking, the failure block of the image request operation is bypassed because [nil isEqual:nil] == NO. By comparing the URL request instead of the URL, the `isEqual:` test passes and the error is properly forwarded to the failure block parameter.
Limiting default Accept-Language header to 6 languages
Merge branch 'experimental-issue-737'

Conflicts:
	AFNetworking/AFHTTPClient.m
Adding lock around AFHTTPRequestOperation -responseString