* [Http] Better handling of nested scope requests in CurlMulti. Requests are now always prepares in the send() method rather than the addRequest() method.
* [BC] Moving Guzzle\Service\Builder to Guzzle\Service\Builder\ServiceBuilder
* [BC] Executing a Command returns the result of the command rather than the command
* [BC] Moving all HTTP parsing logic to Guzzle\Http\Parsers. Allows for faster C implementations if needed.
* [BC] Changing the Guzzle\Http\Message\Response::setProtocol() method to accept a protocol and version in separate args.
* [BC] Moving ResourceIterator* to Guzzle\Service\Resource
* [BC] Completely refactored ResourceIterators to iterate over a cloned command object
* [BC] Moved Guzzle\Http\UriTemplate to Guzzle\Http\Parser\UriTemplate\UriTemplate
* [BC] Guzzle\Guzzle is now deprecated
* Moving Guzzle\Common\Guzzle::inject to Guzzle\Common\Collection::inject
* Adding Guzzle\Version class to give version information about Guzzle
* Adding Guzzle\Http\Utils class to provide getDefaultUserAgent() and getHttpDate()
* Adding Guzzle\Curl\CurlVersion to manage caching curl_version() data
* ServiceDescription and ServiceBuilder are now cacheable using similar configs
* Changing the format of XML and JSON service builder configs. Backwards compatible.
* Cleaned up Cookie parsing
* Trimming the default Guzzle User-Agent header
* Adding a setOnComplete() method to Commands that is called when a command completes
* Keeping track of requests that were mocked in the MockPlugin
* Fixed a caching bug in the CacheAdapterFactory
* Inspector objects can be injected into a Command object
* Refactoring a lot of code and tests to be case insensitive when dealing with headers
* Adding Guzzle\Http\Message\HeaderComparison for easy comparison of HTTP headers using a DSL
* Adding the ability to set global option overrides to service builder configs
* Adding the ability to include other service builder config files from within XML and JSON files
* Moving the parseQuery method out of Url and on to QueryString::fromString() as a static factory method.
* 2.5.0 (05-08-2012)
* Major performance improvements
* [BC] Simplifying Guzzle\Common\Collection. Please check to see if you are using features that are now deprecated.
* [BC] Using a custom validation system that allows a flyweight implementation for much faster validation. No longer using Symfony2 Validation component.
* [BC] No longer supporting "{{ }}" for injecting into command or UriTemplates. Use "{}"
* Added the ability to passed parameters to all requests created by a client
* Added callback functionality to the ExponentialBackoffPlugin
* Using microtime in ExponentialBackoffPlugin to allow more granular backoff stategies.
* Rewinding request stream bodies when retrying requests
* Exception is thrown when JSON response body cannot be decoded
* Added configurable magic method calls to clients and commands. This is off by default.
* Fixed a defect that added a hash to every parsed URL part
* Fixed duplicate none generation for OauthPlugin.
* Emitting an event each time a client is generated by a ServiceBuilder
* Using an ApiParams object instead of a Collection for parameters of an ApiCommand
* cache.* request parameters should be renamed to params.cache.*
* Added the ability to set arbitrary curl options on requests (disable_wire, progress, etc). See CurlHandle.
* Added the ability to disable type validation of service descriptions
* ServiceDescriptions and ServiceBuilders are now Serializable
