#51 Added installation of homebrew on mac when bootstrap the seu

[chr-fritz]

Also performs the installation of homebrew on macOS systems when bootstrapping the seu.

See #51

[coveralls]

Coverage remained the same at 89.583% when pulling 38ac9a0a97ce0e9ba9bc6ec0746e150a1c694774 on chr-fritz:#51-install-brew-on-bootstrap into 0263d95b5dce18c293c5c26ba0410f77581ed45a on seu-as-code:master.

[coveralls]

Coverage remained the same at 89.583% when pulling 38ac9a0a97ce0e9ba9bc6ec0746e150a1c694774 on chr-fritz:#51-install-brew-on-bootstrap into 0263d95b5dce18c293c5c26ba0410f77581ed45a on seu-as-code:master.

[coveralls]

Coverage remained the same at 89.583% when pulling e53c4acf2be9e8281b107d6ce429dd888c8bb7f6 on chr-fritz:#51-install-brew-on-bootstrap into 0263d95b5dce18c293c5c26ba0410f77581ed45a on seu-as-code:master.

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[lreimer]

Coverage decreased (-16.2%) to 73.359%! Can you please add a test?!

[ghost]

Thank you, the title and description now looks good! :bowtie:

[lreimer]

Published 1.2.0 to Bintray and Gradle Plugin Portal: https://plugins.gradle.org/plugin/de.qaware.seu.as.code.homebrew Closes #51