iOS / asi-http-request

…t is running (no success so far)
Added additional safety measures to attempt to address this:
* Use cancelledLock around setDelegate methods
* Use accessors for delegates

Also moved stress tests to new file

Added additional tests  - conditional get, + new stress test
Hopefully fix 2.2.1 device+simulator builds - but I can't test the simulator build is working

…rkQueues to override headers on their main request
This should fix accurate progress tracking for ASINetworkQueues containing ASIS3Requests
Added progress test for ASIS3Request
Hopefully closes gh-9

* Fix shared request queue max concurrent operations

…make everything more reliable
More tests coming soon...

Store credentials for ready-made basic headers in the session store
Authorisation => Authorization
More tests for basic and digest
Fix port matching when finding session credentials - port may well be nil

Fiddle with header organisation / comments

Tweak SSL test

…ing session credentials
Move code for grabbing authentication realm so the realm is available when finding session credentials
Added new tests for shouldPresentCredentialsBeforeChallenge

Added a couple of comments
Add new test to ensure credentials are not reused on a different server

…perform some checking to see if we should apply the credentials
Tweak test

Add test for setting the charset of ASIFormDataRequests

Various changes to proxy code to fix possible problems

Remove tests from fileDownload test that we can't use anymore (because temporaryFileDownloadPath will be nil when a request has completed)

…d where readstreams seemed to be generating events after they should have been cleaned up
I think this might be related to the fact that NSOperationQueues in SN reuse threads, and so different requests may get the same runloop
Also fix typo from last commit

Fix 2.2.1 problem with ASIAuthenticationDialog - no idea why I didn't catch this before

Signed-off-by: Ben Copsey <ben@allseeing-i.com>