👷 use PHP7.1 and add PostgreSQL9.6

Use newer distro for Travis CI runs.
New environment provides PostgreSQL9.6.
Also no need to install custom Doxygen, made it optional.
Changed default PHP environment from PHP7.0 to current PHP7.1.
Changed codecoverage reporting.

.travis.yml

@@ -1,5 +1,5 @@
 #
-# Travis-CI configuration file
+# Travis-CI configuration file for Hubzilla
 #
 ## configure things
 #
@@ -7,6 +7,8 @@
 # see http://about.travis-ci.org/docs/user/languages/php/ for more hints
 language: php
 
+# use newer 'trusty' based distro, old one is 'precise'
+dist: trusty
 # use docker based containers
 sudo: false
 
@@ -21,9 +23,8 @@ addons:
   # Install dependencies for generating API documentation with doxygen
   apt:
     packages:
-      # default doxygen 1.7 is too old, we install our own
-      #- doxygen
-      #- doxygen-latex
+      - doxygen
+      - doxygen-latex
       - graphviz
       - ttf-liberation
 
@@ -36,7 +37,8 @@ addons:
 php:
   - '5.6'
   - '7.0'
-  #- hhvm
+  - '7.1'
+  #- 'hhvm'
 
 # list of environments to test
 env:
@@ -46,6 +48,8 @@ env:
     - GHP_REPO_REF: github.com/redmatrix/hubzilla.git
     # Uncomment if a newer/specific version of Doxygen should be used
     #- DOXY_VER: 1.8.12
+    # Code Coverage is slow, no need to have it in every build
+    - PHPUCOV: "--no-coverage"
   # use matrix only for PHP and MySQL, all other combinations added through includes
   matrix:
     - DB=mysql
@@ -55,18 +59,20 @@ matrix:
   fast_finish: true
   # Additional check combinations
   include:
-    # PHP7, mariadb 10.1
-    - php: '7.0'
-      env: DB=mariadb MARIADB_VERSION=10.1
+    # PHP7.1, mariadb 10.1
+    - php: '7.1'
+      env: DB=mariadb MARIADB_VERSION=10.1 CODECOV=1
       # use mariadb instead of MySQL
       addons:
         mariadb: '10.1'
-    # PHP7, PostgreSQL 9.4
-    - php: '7.0'
-      env: DB=pgsql POSTGRESQL_VERSION=9.4
-      # Use newer postgres than 9.1 default
+    # PHP7.1, PostgreSQL 9.6
+    - php: '7.1'
+      env: DB=pgsql POSTGRESQL_VERSION=9.6
+      # Use newer postgres than 9.2 default
       addons:
-        postgresql: '9.4'
+        postgresql: '9.6'
+      services:
+        - postgresql
    # Exclude from default matrix combinations
 #  exclude:
 #    - php: hhvm
@@ -76,7 +82,7 @@ matrix:
 cache:
   directories:
     - $HOME/.composer/cache
-    - $HOME/doxygen/doxygen-$DOXY_VER/bin
+    #- $HOME/doxygen/doxygen-$DOXY_VER/bin
 
 
 
@@ -93,6 +99,10 @@ install:
 
 # execute any number of scripts before the test run, custom env's are available as variables
 before_script:
+  # Use code coverage config for phpunit
+  - if [[ ! -z $CODECOV ]]; then export PHPUCOV=""; fi
+  # HHVM needs xdebug for code coverage, but extremely slow
+  #- if [[ $TRAVIS_PHP_VERSION =~ ^hhvm ]]; then echo 'xdebug.enable = On' >> /etc/hhvm/php.ini; fi
   # Some preparation tasks of environment
   - ./tests/travis/prepare.sh
   # DB specific prepare scripts
@@ -101,7 +111,7 @@ before_script:
   - if [[ "$DB" == "pgsql" ]]; then ./tests/travis/prepare_pgsql.sh; fi
 
 # omitting "script:" will default to phpunit
-script: ./vendor/bin/phpunit -c tests/phpunit-$DB.xml
+script: ./vendor/bin/phpunit $PHPUCOV -c tests/phpunit-$DB.xml
 
 after_success:
   # Generate API documentation and deploy it to gh-pages