Re-remove 5.2 from travis.yml

There are a bunch of failing tests in the JsonView and HttpSocket
classes, both these failures are caused by annoying differences in PHP
that I don't think are really worth working around.

.travis.yml

@@ -1,7 +1,6 @@
 language: php
 
 php:
-  - 5.2
   - 5.3
   - 5.4
   - 5.5
@@ -27,8 +26,8 @@ matrix:
 
 
 before_script:
-  - sh -c "if [ '$TRAVIS_PHP_VERSION' != '5.2' ]; then composer global require 'phpunit/phpunit=3.7.33'; fi"
-  - sh -c "if [ '$TRAVIS_PHP_VERSION' != '5.2' ]; then ln -s ~/.composer/vendor/phpunit/phpunit/PHPUnit ./vendors/PHPUnit; fi"
+  - sh -c "composer global require 'phpunit/phpunit=3.7.33'"
+  - sh -c "ln -s ~/.composer/vendor/phpunit/phpunit/PHPUnit ./vendors/PHPUnit"
   - sudo locale-gen de_DE
   - sh -c "if [ '$DB' = 'mysql' ]; then mysql -e 'CREATE DATABASE cakephp_test;'; fi"
   - sh -c "if [ '$DB' = 'mysql' ]; then mysql -e 'CREATE DATABASE cakephp_test2;'; fi"