This is a working version of multipart streaming.

 - Fixed missing CRLF after header string.
 - Fixed not traversing through the buffer while reading.
 - Fixed content length of body stream are incorrect when attempts to finalize the multipart form data due to boundary settings not set yet.
 - Create a method named `setInitialAndFinalBoundaries` that attempts to reset all HTTP body parts boundary settings first before setting the initial and final boundaries.

Tested successfully on my own codes that does photo uploading to Flickr using `appendPartWithFileData:name:fileName:mimeType:`. I have not tried uploading from file URL but don't foresee any issue.
Preventing negative values for the activity indicator counter
Use MAX to constrain _activityCount to non-negative numbers
Adding additional documentation about usage for AFNetworkActivityIndicatorManager
Merge branch 'master' into lxcid-experimental-refined-stream

Conflicts:
	AFNetworking/AFHTTPClient.h
	AFNetworking/AFHTTPClient.m
Fixing broken merge
Stashing refactoring and reorganizing
Additional refactoring and reformatting

Fixing memory management issue in AFContentTypeForPathExtension
Removing #imports for CoreServices
Disabling HTTP pipelining for image request operations
Changing NSError ** parameter to NSError * __autoreleasing *

Minor reformatting of AFHTTPClient method signatures
Add error when building without ARC to a central file.
Import UIKit to avoid build errors from UIDevice references in "User-Agent" default header. closes AFNetworking/AFNetworking#542
Merge pull request #543 from blakewatters/bugfix/import-uikit-in-client

Conditionally Import UIKit in AFHTTPClient to avoid build errors
Merge pull request #541 from tewha/master

Add error when building without ARC
Updating notes about ARC and requirements
[Issue #546][Issue #513] Adding AFMultipartFormData -throttleBandwidthWithPacketSize:delay:
Merge branch 'master' of github.com:AFNetworking/AFNetworking
Fixing warnings detected by -Weverything
Fixing compiler warnings relating to incorrect use of #if rather than #ifdef