Add Travis CI support

.travis.yml

+language: php
+
+sudo: false
+
+cache:
+  directories:
+    - $HOME/.composer/cache
+
+php:
+ - 7.1
+ - 7.0
+ - 5.6
+
+addons:
+ postgresql: "9.3"
+
+env:
+ global:
+  - MOODLE_BRANCH=MOODLE_32_STABLE
+ matrix:
+  - DB=pgsql
+  - DB=mysqli
+
+before_install:
+  - phpenv config-rm xdebug.ini
+  - cd ../..
+  - composer selfupdate
+  - composer create-project -n --no-dev --prefer-dist moodlerooms/moodle-plugin-ci ci ^1
+  - export PATH="$(cd ci/bin; pwd):$(cd ci/vendor/bin; pwd):$PATH"
+
+install:
+  - moodle-plugin-ci install
+
+script:
+  - moodle-plugin-ci phplint
+  - moodle-plugin-ci phpcpd || true
+  - moodle-plugin-ci phpmd
+  - moodle-plugin-ci codechecker || true
+  - moodle-plugin-ci csslint
+  - moodle-plugin-ci shifter
+  - moodle-plugin-ci jshint || true
+  - moodle-plugin-ci validate
+  - moodle-plugin-ci phpunit
+  - moodle-plugin-ci behat

CHANGES.md

@@ -7,6 +7,7 @@ Changes
 ### Unreleased
 
 * 2017-06-16 - Bugfix: Prevent debug notice when there are no modules supporting the print_overview() function
+* 2017-05-29 - Add Travis CI support
 
 ### v3.2-r5
 

README.md

 moodle-block_course_overview_campus
 ===================================
 
+[![Build Status](https://travis-ci.org/moodleuulm/moodle-block_course_overview_campus.svg?branch=master)](https://travis-ci.org/moodleuulm/moodle-block_course_overview_campus)
+
 Moodle block which provides all functionality of block_course_overview, provides additional filters to be used on university campuses as well as the possibility to hide courses and course news from the course list