Plone.app.robotframework

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- "Create content" keyword fixes: Fix creation of random images, add image to
News Item if not defined, add file to File if not defined.
[thet]

- Also detect mockup-based modals in the "Click Overlay Link" and
"Click Overlay Button" keywords.
[davisagli]

- Read ``use_email_as_login`` setting from the registry instead of portal
properties (see https://github.com/plone/Products.CMFPlone/issues/216).
[jcerjak]

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- Fix dependency on plone.namedfile to be optional
[hvelarde, datakurre]

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- Restore robotsuite into direct dependencies for convenience
[datakurre]

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- Fix package dependencies; Remove needless dependency on unittest2 Remove
implicit dependency on z3c.relationfield unless it's required by the tested
add-on
[vincentfretin, hvelarde, datakurre]

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- Fix issue where Dexterity content creation without explicit id fails
[datakurre]
- Add user keywords 'a logged in test user' and 'a logged in site owner'.
[tisto]
- Add user.robot keywords.
[tisto]
[datakurre]
- Refactor Dexterity not to be explicit dependency
[datakurre]
- Add default RobotRemote instance to support enabling the default remote
library with collective.monkeypatcher (see p.a.robotframework.testing)
[datakurre]

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- Make the 'id' parameter optional for the 'create content' keyword.
[timo]