Create .travis-ci.yml adding PHP lint

.travis.yml

@@ -0,0 +1,16 @@
+language: php
+
+php:
+  - 5.6
+  - 7.0
+  - 7.1
+  - 7.2
+
+matrix:
+  allow_failures:
+    - php: 7.2
+
+script:
+  - '! find . -not \( -path ./lib/PEAR -prune \) -not \( -path ./lib/phpseclib -prune \) -not \( -path ./lib/Zend -prune \) -type f -name "*.php" -exec php -d error_reporting=32767 -l {} \; 2>&1 >&- | grep "^"'
+  - '! find app/design -type f -name "*.phtml" -exec php -d error_reporting=32767 -l {} \; 2>&1 >&- | grep "^"'
+