Allow Travis to build tags and version branches (#4)

* Allow Travis to build tags and version branches

* Use conditions

* Only run Code Quality stage on pull requests

Author: thewilkybarkid

.travis.yml

@@ -30,13 +30,20 @@ jobs:
           script:
               - vendor/bin/phpcs -p
 
+stages:
+    - Test
+    - name: Code Quality
+      if: type = pull_request
+
 allow_failures:
     - php: nightly
 
 cache:
     directories:
         - $HOME/.composer/cache/files
 
-branches:
-    only:
-        - master
+if: |
+    branch = master OR \
+    branch =~ /^(?:[0-9]|[1-9][0-9]*)\.(?:[0-9]|[1-9][0-9]*)$/ OR \
+    tag IS present OR \
+    type = pull_request