update travis with new phpunit52 and cache directives

.travis.yml

@@ -24,7 +24,7 @@ install: |
     # special handling for PHP 5.2 testing as there is no composer available
     export X="$HOME/.idiorm/bin"
     mkdir -p "$X"
-    curl -sSfL https://github.com/treffynnon/php5.2-phpunit3.6.12-phar/releases/download/1.0.0/php52-phpunit.phar -o "$X/phpunit"
+    curl -sSfL https://github.com/treffynnon/php5.2-phpunit3.6.12-phar/releases/download/1.0.2/php52-phpunit.phar -o "$X/phpunit"
     chmod +x "$X/phpunit"
   fi
 script: |
@@ -35,3 +35,8 @@ script: |
     # we need phpunit-3.6.12, but there is no phar file for it so comment out for now
     $X/phpunit --colors --coverage-text
   fi
+cache:
+  directories:
+    - $HOME/.composer/cache
+    - $HOME/.idiorm
+    - vendor