Use phpunit from vendor dir

Signed-off-by: Michal Čihař <michal@cihar.com>

Author: nijel

.travis.yml

@@ -27,7 +27,7 @@ install:
   - composer install
 
 script: 
-  - phpunit --configuration phpunit.xml
+  - ./vendor/bin/phpunit --configuration phpunit.xml
   - cd examples
   - php create_shapefile.php
   - php read_point.php > /dev/null