Pilosa 0.6.0

[codysoyland]

• Have you followed the guidelines for contributing?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install <formula>)?

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This bumps the version of the Pilosa formula to 0.6.0.
This also includes the additional build instructions to produce the WebUI as detailed in #15311 and #16336.

[ilovezfs]

Thanks @codysoyland! Shipped :)