Add a stacktrace to Travis

It's complaining about a bad keystore, but I validated that it builds correctly locally...

.travis.yml

@@ -4,15 +4,16 @@ env:
   - ANDROID_HOME="./android-sdk-linux"
   global:
   - secure: FFXEK5dnQaJ2nSyaggVO66uNfpM6WYdS962qjY4ry9OumoK9OHg25MeQPrWmQurUaDDRfzdjMTs0UicWvJAnka846dDpYVbt0bpWbnNsq8vb05h1XhCsjjnEwcgPzbbyoAecmx7m1noAhkjFVnqmUhnjoYIsNd/pIRplO+r+0PY=
-  - secure: BezK2LQRlHA4bgfShHH9l8/N0roGcMCxzAXV3CoGw4OWp6npUbIGvj1H4scA2OAMpct7u6fS9T0//FQehe6tbsHniVfsRxrmwsj8SqXQ6E3tQ4lZeFu9q6dy2qgIaktY9q2SIkf+/1DG5b7gd/KJX4luU8LX1RErorco6+MGuoQ=
   - secure: ST7fOgOrFFcjmxvnfu0mlQIi1uQ3/59hQk/LDRjucPCvhW1XjSfJVZvT7k9qgX7lgQf+fie0UekR26bX4RdxcJxLkJ9QH0ykr2WFlGWqXRuI0QcFMM4JMhwzCR65+2JMeI77SRvPLvCCRUO2thAEFze+rICqzIjwghcf4/2tc6w=
 before_install:
 - openssl aes-256-cbc -K $encrypted_b017c1e684ac_key -iv $encrypted_b017c1e684ac_iv
   -in app/src/main/play/play_api.p12.enc -out app/src/main/play/play_api.p12 -d
 - bash android_install.sh
 script:
-- ./gradlew test
+- ./gradlew test --stacktrace
 after_success:
 - ./gradlew jacocoTestReport coveralls
-- if [ $TRAVIS_TAG ]; then echo "Publishing to Play store..." ./gradlew publishRelease
+- if [ $TRAVIS_TAG ]; then
+  echo "Publishing to Play store..."
+  ./gradlew publishRelease
   fi