Revert "Merge branch 'nolanw-request-delegate-gets-failed-auth-challenge'"

This reverts commit d6510d963f459135d7d15f66f29cb7aec486ea7f, reversing
changes made to a1e2061106ca74f746bac1460a3392a961c70ea2.
RKRequest: Added null check for HTTP Basic username and password. Closes #493.
Fix for ocassional crashes using http basic auth
Remove 'file' from Specs/Uploads group. This is a test asset that should not be part of the project.
Updated visual install guide images to reflect build process changes
Add test for an array being mapped to an NSOrderedSet.
Add support for mapping an array to an NSOrderedSet.
Add test to make sure an NSOrderedSet can be mapped to an NSArray.
Merge pull request #504 from bmorton/ordered-set

Integrate support for NSOrderedSet
This fixes a bug where attributes of a object would also get added to parent object.

XML to parse
```
<exchange_rate type="XML_RATE_TYPE_EBNK_MIDDLE" valid_from="2011-08-03 00:00:00.0">
    <currency name="AUD" quota="1" rate="18.416"/>
    <currency name="HRK" quota="1" rate="3.25017"/>
    <currency name="DKK" quota="1" rate="3.251"/>
</exchange_rate>
```

BEFORE FIX
```
<CFBasicHash 0xab93140 [0x520b38]>{type = mutable dict, count = 1,
entries =>
	0 : <CFString 0xabacac0 [0x520b38]>{contents = "exchange_rate"} = <CFBasicHash 0xaba99e0 [0x520b38]>{type = mutable dict, count = 6,
entries =>
	0 : <CFString 0xabc1e40 [0x520b38]>{contents = "currency"} = (
        {
        name = AUD;
        quota = 1;
        rate = "18.416";
    },
        {
        name = HRK;
        quota = 1;
        rate = "3.25017";
    },
        {
        name = DKK;
        quota = 1;
        rate = "3.251";
    }
)
	1 : <CFString 0xaba9940 [0x520b38]>{contents = "name"} = <CFString 0xaba9960 [0x520b38]>{contents = "DKK"}
	2 : <CFString 0xaba9990 [0x520b38]>{contents = "rate"} = <CFString 0xaba99c0 [0x520b38]>{contents = "3.251"}
	3 : <CFString 0xaba9980 [0x520b38]>{contents = "quota"} = <CFString 0xaba99a0 [0x520b38]>{contents = "1"}
	4 : <CFString 0xab93180 [0x520b38]>{contents = "type"} = <CFString 0xab931b0 [0x520b38]>{contents = "XML_RATE_TYPE_EBNK_MIDDLE"}
	5 : <CFString 0xab93190 [0x520b38]>{contents = "valid_from"} = <CFString 0xab93220 [0x520b38]>{contents = "2011-08-03 00:00:00.0"}
}

}
```

AFTER FIX
```
<CFBasicHash 0xa689830 [0x520b38]>{type = mutable dict, count = 1,
entries =>
	0 : <CFString 0xa6816a0 [0x520b38]>{contents = "exchange_rate"} = <CFBasicHash 0xa6897c0 [0x520b38]>{type = mutable dict, count = 3,
entries =>
	0 : <CFString 0xa692100 [0x520b38]>{contents = "valid_from"} = <CFString 0xa692190 [0x520b38]>{contents = "2011-08-03 00:00:00.0"}
	1 : <CFString 0xa680860 [0x520b38]>{contents = "currency"} = (
        {
        name = AUD;
        quota = 1;
        rate = "18.416";
    },
        {
        name = HRK;
        quota = 1;
        rate = "3.25017";
    },
        {
        name = DKK;
        quota = 1;
        rate = "3.251";
    }
)
	2 : <CFString 0xa6920f0 [0x520b38]>{contents = "type"} = <CFString 0xa692120 [0x520b38]>{contents = "XML_RATE_TYPE_EBNK_MIDDLE"}
}

}
```
Add cast to int to failureError.code so this test works on both the iOS and Mac OS X frameworks.
Add test for confirming that an RKClient object can pass through a timeoutInterval to a request.
Add /timeout route to fake a long response for testing RKRequest's timeout interval.  We need to leave this around 4 seconds so we don't hold up the ruby process too long and cause the tests launched after to fail.
Move the invalidateTimeoutTimer call in RKResponse from didReceiveData to didReceiveResponse and didFailWithError so we are sure its always called and as early as possible.
Responsibly invalidate the timeoutTimer when the RKRequest is deallocated.  Move location of timer creation for asynchronous request.
Add timeoutInterval property to RKClient so that it can be passed on to RKRequest.
Invalidate the RKRequest timer in RKResponse when the NSURLConnection begins receiving data.
Add support for timing out an RKRequest via a timeoutTimer and a timeout property.
* Add timeoutInterval property on RKRequest with a default value of 120.0
* Add timeout method that is called by the timer when the timeout interval has been exceeded to cancel the request and return an error via didFailLoadWithError:
* Add invalidateTimeoutTimer method that is called by RKResponse when the NSURLConnection begins receiving data.
* Add call to invalidateTimeoutTimer in RKRequest cancelAndInformDelegate: so we don't have a dangling timer.
* Add timer creation to sendAsynchronously and sendSynchronously
Add RKRequestConnectionTimeoutError to throw when our connection timeout has been exceeded.
Merge branch 'bmorton-timeouts'