Collective.impersonate

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- upgrade to Plone 5.1.5, add 'Framework :: Plone :: Addon' pypi classifier, tweak docs
[tkimnguyen]

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- update docs to show Impersonate portal action
[tkimnguyen]

- add user documentation
[tkimnguyen]

- add Impersonate personal menu item for Manager role
[tkimnguyen]

- fix buildout, isort fixes, flake8 fixes, Travis fixes
[tkimnguyen]

- upgrade to Plone 5.0.10
[tkimnguyen]

- tweak Travis xvfb start
[tkimnguyen]

- fix test buildout
[tkimnguyen]

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- Brownbag release.
[zupo]

----------------

- Initial release.
[zupo]