TravisCI: temporary build matrix fix to avoid #279

Reference: https://docs.travis-ci.com/user/customizing-the-build/#build-matrix

.travis.yml

@@ -1,8 +1,18 @@
 language: scala
 jdk: oraclejdk8
 dist: trusty
-scala:
-  - 2.11.8
+matrix:
+  include:
+  - name: "PSForever Tests"
+    scala: 2.11.8
+    env: SBT_COMMAND="test:compile test"
+  - name: "PSForever Test Coverage"
+    scala: 2.11.8
+    env: SBT_COMMAND="coverage test:compile test coverageReport" ALLOW_FAIL=1
+  allow_failures:
+    - env: ALLOW_FAIL=1
+  fast_finish: true
+
 cache:
   directories:
     - $HOME/.ivy2/cache
@@ -11,10 +21,11 @@ before_cache:
   - rm -fv $HOME/.ivy2/.sbt.ivy.lock
   - find $HOME/.ivy2/cache -name "ivydata-*.properties" -print -delete
   - find $HOME/.sbt        -name "*.lock"               -print -delete
+  
 before_script:
   - wget https://github.com/psforever/PSCrypto/releases/download/v1.1/pscrypto-lib-1.1.zip
   - unzip pscrypto-lib-1.1.zip
 script:
-  - sbt ++$TRAVIS_SCALA_VERSION clean coverage test:compile test coverageReport
+  - sbt ++$TRAVIS_SCALA_VERSION $SBT_COMMAND  
 after_success:
     - bash <(curl -s https://codecov.io/bash)