Updated travis testing to work with new helper configuration (#175)

* Updated travis to call phpunit globally rather then booting application first

.travis.yml

@@ -6,7 +6,6 @@ php:
 
 cache:
   directories:
-    - vendor
     - node_modules
     - $HOME/.composer/cache
 
@@ -29,8 +28,10 @@ before_script:
   - composer install --prefer-dist --no-interaction
   - npm install
   - ./node_modules/.bin/gulp
+  - php artisan clear-compiled -n
+  - php artisan optimize -n
   - php artisan migrate --force -n --database=mysql_testing
   - php artisan db:seed --force -n --class=DummyContentSeeder --database=mysql_testing
 
 script:
-  - vendor/bin/phpunit
+  - phpunit

app/helpers.php

@@ -2,7 +2,6 @@
 
 use BookStack\Ownable;
 
-if (!function_exists('versioned_asset')) {
 /**
  * Get the path to a versioned file.
  *
@@ -29,7 +28,6 @@ if (!function_exists('versioned_asset')) {
 
     throw new InvalidArgumentException("File {$file} not defined in asset manifest.");
 }
-}
 
 /**
  * Check if the current user has a permission.