Jib: Adds init script to use with any Gradle project.

[coollog]

Fixes #63

The init script auto-applies jib-gradle-plugin to the Gradle project. Also fixes the caching for the jib-gradle BuildTemplate.

/cc @loosebazooka /cc @saturnism

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In response to this:

Fixes #63

The init script auto-applies jib-gradle-plugin to the Gradle project. Also fixes the caching for the jib-gradle BuildTemplate.

/cc loosebazooka /cc saturnism

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