Jaraco-packaging

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Added ``jaraco.packaging.make-tree`` utility for taking
output from pipdeptree and making a tree of it.

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Drop support for Python 2.6.

Re-aligned to use pkg_resources-managed technique for
the jaraco namespace, all package of which must elect one
technique or another.

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Use pkgutil for namespace package handling. Experimental
process based on pypa/python-packaging-user-guide265.

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Remove ``release`` module.

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Add Python 2.6 support for Sphinx extension.

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Added Sphinx extension for loading several keys from
their package metadata.