Linting with travis (we have to start somewhere)

.travis.yml

@@ -0,0 +1,33 @@
+language: php
+php:
+  - 5.3
+  - 5.4
+  - 5.5
+  - 5.6
+  - 7
+  - hhvm
+
+matrix:
+  fast_finish: true
+
+env:
+  matrix:
+    - LOWEST_DEPS=""
+    - LOWEST_DEPS="--prefer-lowest"
+
+services:
+  - mysql
+
+sudo: false
+
+cache: vendor
+
+before_script:
+  # - mysql -e 'create database sabredav'
+  # - composer self-update
+  - composer update --prefer-source $LOWEST_DEPS
+
+script:
+    - find Core -name "*.php" | xargs -n1 php -l 
+    # - ./bin/sabre-cs-fixer fix lib/ --dry-run --diff
+