ENHANCEEMENT: Mark coverage builds as allowed to fail and fast finish…

…, so as to get feedback faster

.travis.yml

@@ -26,18 +26,18 @@ env:
     - COVERAGE=0
 
 matrix:
+  fast_finish: true
   allow_failures:
     - php: hhvm-nightly
     - php: 7.0
+    - COVERAGE: 1
   include:
     - php: 5.6
       env: DB=PGSQL
     - php: 5.6
       env: DB=SQLITE
     - php: hhvm
       env: DB=MYSQL
-    - php: 5.6
-      env: DB=MYSQL CORE_RELEASE=3.2 COVERAGE=1
     - php: 5.6
       env: DB=PGSQL CORE_RELEASE=3.2
     - php: 5.6
@@ -50,7 +50,8 @@ matrix:
       env: DB=MYSQL CORE_RELEASE=3.2
     - php: hhvm
       env: DB=MYSQL CORE_RELEASE=3.2
-
+    - php: 5.6
+      env: DB=MYSQL CORE_RELEASE=3.2 COVERAGE=1
 
 before_script:
   - phpenv rehash