Minor cleanups

[chanseokoh]

No description provided.

[TadCordle]

What's with the travis failure?

/home/travis/build/GoogleContainerTools/jib/jib-gradle-plugin/src/main/java/com/google/cloud/tools/jib/gradle/GradleProjectProperties.java:238: error: cannot find symbol
          consoleLogger.log(Level.DEBUG, "Using JAR: " + jarPath);
                            ^

[chanseokoh]

That's a complete non-sense. The /pr Travis build is for running builds after merging this PR, so perhaps something got confused or mixed up. I've rebased at HEAD, so let's see if this works.

[chanseokoh]

Aha, kind of merge conflicts, since consoleLogger.log() was introduced in a separate PR. Taken care of after merged with master.

[TadCordle]

Hmm, travis still failing, but because it's failing to unzip something.

[chanseokoh]

Suspected Travis cache corruption. Cleared the cache, reran Travis, and it seems working.