Prepare for v2.2.3

[bshaffer]

Bug Fixes

• Fixing the ability to provide custom retryMap (Fixing the ability to provide custom retryMap #1488)
• Use new auth urls (Use new auth urls #1492)
• Use double pipes in composer dependency file (Use double pipes in composer dependency file #1505)
• Fix usage of undefined constants (Fix usage of undefined constants #1621)
• Specify configuration filepath when config file is not found (Specify configuration filepath when config file is not found #1626)

Documentation, Tests, and Examples

• Add UnexpectedValueException to documentation (Add UnexpectedValueException to documentation #1592)
• Add batch reset warning (Add batch reset warning #1613)
• Remove extra setAccessKey call in examples. (examples: Remove extra setAccessKey call. #1469)
• Updates phpdoc for Google_Client::setScopes (Updates footprint cq phpdoc to include string for $scopes #1465)
• Small changes to examples/index.php (Update index.php #1460)
• misc updates to examples/url-shortener.php (Add Placeholder and required attr #1456)
• Update docs to install latest 2.x version (Update docs to install latest 2.x version #1491)
• Fix build status image (Fix build status image #1549)
• fix tests (Fix tests - expect getStatusCode to return a 200 code #1560)
• Update Google_Client::revokeToken() docblock. (revokeToken() accepts arrray too #1609)
• Add guzzle config to readme (Add guzzle config to readme #1625)