First cut of working URL fetch for HTTP requests for WordPress 3.7 and above.
Header keys need to be converted to lower case.
If a header appears in the response multiple times then it is converted to an array of values.
Add some more connection defaults.
Add a change log notice for the URLFetch based HTTP client.
Use descriptive names for the constants passed to add_filter.
Flush memcache when activating the app engine plugin so that HTTP pages are refreshed - they might not have been initially retrieved correctly without the URL fetch client.
Add a filter so we don't use fsockopen with older versions of WordPress.
Merge pull request #9 from GoogleCloudPlatform/http_stream_fix

Create a URL fetch HTTP client for handling all HTTP requests on WordPress 3.7+.