Tweak travis config

.travis.yml

@@ -1,34 +1,46 @@
 language: php
 
+php:
+  - 5.3
+  - 5.4
+  - 5.5
+  - 5.6
+  - 7
+  - hhvm
+
 matrix:
-    include:
-        - php: 5.3
-        - php: 5.4
-        - php: 5.5
-        - php: 5.6
-        - php: 5.6
-          env: deps=low
-        - php: 5.6
-          env: deps=high
-        - php: 7.0
-        - php: hhvm
-    fast_finish: true
+  include:
+    - php: 5.3
+      env: dependencies=lowest
+    - php: 5.4
+      env: dependencies=lowest
+    - php: 5.5
+      env: dependencies=lowest
+    - php: 5.6
+      env: dependencies=lowest
+    - php: 7
+      env: dependencies=lowest
+    - php: hhvm
+      env: dependencies=lowest
+  fast_finish: true
 
-env:
-    global:
-        - deps=no
+cache:
+  directories:
+    - vendor
+    - $HOME/.composer/cache
 
 before_install:
-  - composer self-update
+  - composer self-update -q
+  - if [ -n "$GH_TOKEN" ]; then composer config github-oauth.github.com ${GH_TOKEN}; fi;
 
 install:
-  - if [ "$deps" = "no" ]; then composer install --prefer-source; fi;
+  - if [ -z "$dependencies" ]; then travis_retry composer install --no-interaction; fi;
+  - if [ "$dependencies" = "lowest" ]; then travis_retry composer update --prefer-lowest --no-interaction; fi;
+  - composer show -i
 
 script:
-  - if [ "$deps" = "high" ]; then composer update --prefer-source; fi;
-  - if [ "$deps" = "low" ]; then composer update --prefer-source --prefer-lowest --prefer-stable; fi;
-  - phpunit -v --coverage-text --coverage-clover ./build/logs/clover.xml
+  - phpunit -v --coverage-text --coverage-clover=./build/logs/clover.xml
 
 after_script:
-  - composer require satooshi/php-coveralls:dev-master --prefer-source
-  - php vendor/bin/coveralls -v
+  - travis_retry composer require satooshi/php-coveralls:dev-master --no-interaction
+  - if [ -f ./build/logs/clover.xml ]; then php vendor/bin/coveralls -v; fi