Merge pull request #177 from bantu/php5.3-minimum-requirement

Make PHP 5.3 the minimum requirement

* bantu/php5.3-minimum-requirement:
  Remove the PHP 5.2 travis environment.
  Require PHP 5.3 in composer.json

.travis.yml

@@ -1,7 +1,6 @@
 language: php
 
 php:
-  - 5.2
   - 5.3.3
   - 5.3
   - 5.4

composer.json

@@ -29,7 +29,7 @@
         }
     ],
     "require": {
-        "php": ">=5.0.0"
+        "php": ">=5.3.0"
     },
     "suggest": {
         "ext-mcrypt": "Install the Mcrypt extension in order to speed up a wide variety of cryptographic operations.",