Update ServerTests/basic_auth.php

Fixed a small spelling mistake on line 15
fixed method name in example in documantation

`setAuthorizationHeaderValue:forAuthType:`
test `registerOperationSubclass:`
added some tests for operation

test `addHeaders:`
test Authorization header
test completion blocks calls
test calls for `operationSucceeded` and `operationFilaedWithError:`
improved test failure description for tests for status codes
Merge pull request #196 from michaeltrimm/patch-1

Update ServerTests/basic_auth.php
Check blocks are non-nil before invoking them in imageAtURL
added failing tests to show that `hash` has to be implemented

[#204]
added `hash` method for operation

[#204]
a little optimized `isEqual` method

https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CocoaFundamentals/CocoaObjects/CocoaObjects.html#//apple_ref/doc/uid/TP40002974-CH4-SW61
http://stackoverflow.com/questions/254281/best-practices-for-overriding-isequal-and-hash/254380
Upload stream works
Merge pull request #266 from juliengrimault/master

Check block != nil before invoking them in imageAtURL:completionHandler:errorHandler:
Fixed a EXC-BAD-ACCESS crash
Merge branch 'master' of github.com:MugunthKumar/MKNetworkKit
Renamed a method in a category to avoid conflict with a private api
Added a property that will disable cache on a operation level, added a property to override and cache https urls
Images will be cached even if they are on secure server
fixing merge error