Shift minimum PHP version to 5.4

Author: Jamie Hannaford

README.md

@@ -16,9 +16,11 @@ so that you can still use the SDK with a pure OpenStack instance
 
 Requirements
 ------------
-* PHP >=5.3.3
+* PHP >=5.4
 * cURL extension for PHP
 
+**Note**: Since PHP 5.3 has reached [end of life](http://php.net/eol.php) and is no longer officially supported, we are moving to 5.4 as a minimum requirement. If upgrading is not an option and you still need a stable version of the SDK for 5.3, please follow [this guide](http://docs.php-opencloud.com/en/latest/using-php-5.3).
+
 Installation
 ------------
 You must install this library through Composer:

composer.json

@@ -26,12 +26,11 @@
         }
     },
     "require": {
-        "php" : ">=5.3.3",
+        "php" : ">=5.4",
         "guzzle/guzzle" : "~3.8",
         "psr/log": "~1.0"
     },
     "require-dev" : {
-        "php": ">=5.4",
         "phpunit/phpunit": "4.3.*",
         "satooshi/php-coveralls": "0.6.*@dev",
         "jakub-onderka/php-parallel-lint": "0.*",

doc/using-php-5.4.rst

@@ -0,0 +1,20 @@
+Using the SDK with PHP v5.3
+===========================
+
+Since PHP 5.3 has entered EOL and no longer receives security updates, we have bumped the minimum requirement to 5.4. Using 5.3 is still possible, however, but you will need to use an older stable version of the SDK. There are two ways to do this.
+
+The first way is by requiring it through the command line:
+
+.. code-block:: bash
+
+  composer require rackspace/php-opencloud:1.12
+
+The second way is by updating your composer.json file, and specifying the appropriate version of the SDK:
+
+.. code-block:: json
+
+  "require": {
+    "rackspace/php-opencloud": "~1.12"
+  }
+
+Note that **1.12** is the last minor release supporting PHP 5.3. Version 1.13 and above has shifted to PHP 5.4.