Merge branch '3.2'

* 3.2:
  Disable code coverage generation for most builds

Author: alcaeus

.travis.yml

@@ -15,7 +15,7 @@ env:
 matrix:
   include:
     - php: 5.6
-      env: DRIVER_VERSION="1.5.8" COMPOSER_FLAGS="--prefer-dist --prefer-lowest"
+      env: DRIVER_VERSION="1.5.8" COMPOSER_FLAGS="--prefer-dist --prefer-lowest" PHPUNIT_FLAGS="--coverage-clover=coverage.clover"
 
 cache:
   directories:
@@ -31,7 +31,7 @@ install:
   - composer update ${COMPOSER_FLAGS}
 
 script:
-    - ./vendor/bin/phpunit --coverage-clover=coverage.clover
+    - ./vendor/bin/phpunit ${PHPUNIT_FLAGS}
 
 after_script:
   - wget https://scrutinizer-ci.com/ocular.phar