Plock

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- Add Plone 5 support. Since Plock only supports a single version of Plone ("latest"), Plone 5 is now the default.

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- Configure https://raw.githubusercontent.com/plock/pins/master/relstorage in ``heroku.cfg``

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- Configure ``USERNAME`` and ``PASSWORD`` env in ``heroku.cfg``

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- Create ``heroku.cfg``

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- Add ``-u, --use`` to run Plock with existing Plock buildout.cfg files.

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- Update GitHub content URL to https://raw.githubusercontent.com
- Rebrand: "Pip installs Plock. Plock installs Plone."
- Rename ``--write-only`` to ``--write``
- Rename ``--list-addons`` to ``--list``
- Rename ``--unified-only`` to ``--cache``
- Rename ``--no-unified`` to ``--no-cache``
- (Re)add ``--no-buildout`` option