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"}
}

}
```
Merge pull request #505 from spenrose/xml-attributes-bug

This fixes a bug where attributes of a object would also get added to parent object.
Add test to make sure that only one timeoutTimer is created.
Move RKRequest timeoutTimer creation to a helper method so that we can test the number of times it is invoked.
Remove duplicate timer creation. Fixes #517.
Fix test for pull request 519
Invalidate the timer before dispatching error delegate callbacks
Fix indentation inconsistencies in dealloc
Fix how testShouldTimeoutAtInterval builds its URL so that the test passes again.
Added documentation for handling GET and POST params.
Remove Appledoc significant asterisk in non-documenting comment
Merge pull request #539 from bmorton/fix-baseurl-in-failing-timeout-test

Fix base URL in failing timeout test
Migrated new files into Public/ headers for Framework target
Fixes an issue where the timeoutTimer wouldn't work for a synchronous request.  Fixes #551.

* Removed the timer creation in RKRequest sendSynchronously.
* Pass the timeoutInterval to the NSURLRequest that is responsible for the synchronous request.
* Check if the error returned by NSURLRequest is NSURLErrorTimedOut and return an RKRequestConnectionTimeoutError if necessary.
* Add test for making sure the timeout works properly for a synchronous request.
Merge pull request #553 from bmorton/551-fix-synchronous-timeout

Fix Synchronous Request Timeout
Clean up documentation and organization in RKClient header.

* Reorganize blocks of deprecated methods to move them to the bottom of the file.
* Add/change appledoc section headers to be consistent.
* Reorganize methods and properties to fit under their respective sections.
* Fix documentation whitespace to be consistent.
* Fill in missing documentation, parameter definitions, and return values.
* Clean up asterisk placements in variable declarations.
Clean up documentation and formatting in RKOAuthClient header and implementation.

* Add example code to overview.
* Move <RKRequestDelegate> implementation detail to RKOAuthClient.m to clean up documentation
* Add missing documentation to all properties and methods.
* Rearrange sections for documentation purposes.
* Format blocks of documentation to match the project standard.
* Cleanup spacing in @property lines.
* Remove delegate assignment in initializers to be consistent with the rest of the project.
* Fix spec instances where the initializer with the delegate was used.
Clean up spacing in RKNotifications constants.
Clean up documentation and formatting in RKParams header.

* Add documentation and example to overview.
* Clean up asterisk placements in variable declarations.
* Add appledoc section headers.
* Fill in missing documentation, parameter definitions, and return values.
* Clean up whitespace inconsistencies.
Clean up documentation and formatting in RKParamsAttachment header.

* Add documentation to overview.
* Clean up asterisk placements in variable declarations.
* Add appledoc section headers.
* Reorganize methods and properties for documentation clarity.
* Fill in missing documentation, parameter definitions, and return values.
* Clean up whitespace inconsistencies.