provide mechanism to not include git.properties file in resulting jar

[kriscfoster]

#163

Motivation?

Sometimes people don't want to include the git.properties in the jar they will deploy (security etc).

How?

Providing mechanism to not include git.properties file in the resulting jar e.g.

springboot(
    name = "abc",
    boot_app_class = "x.y.z",
    include_git_properties_file = False,
    java_library = ":abc",
)

The above target results in the following behaviour:

jar tf bazel-bin/projects/something/abc.jar | grep git.properties

<whole lot of nothing>

Also generated new Stardocs (this is cool, never saw it before).