Update Travis CI settings

- define PHP versions as string in yaml
- remove not needed caches
- remove ocular upload (we do run tests on scrutinizer directly)
- use phpunit from vendor dir

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

Author: nijel

.travis.yml

@@ -1,19 +1,19 @@
 language: php
 
 php:
-  - 5.3
-  - 5.4
-  - 5.5
-  - 5.6
-  - 7.0
-  - 7.1
-  - nightly
-  - hhvm
+  - "5.3"
+  - "5.4"
+  - "5.5"
+  - "5.6"
+  - "7.0"
+  - "7.1"
+  - "hhvm"
+  - "nightly"
 
 matrix:
   fast_finish: true
   allow_failures:
-    - php: nightly
+    - php: "nightly"
 
 sudo: false
 
@@ -33,5 +33,6 @@ after_success:
 cache:
   directories:
     - $HOME/.composer/cache
-    - vendor
-    - ocular.phar
+
+script: 
+  - ./vendor/bin/phpunit --configuration phpunit.xml