Robotsuite

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- Add optional support for retrying a failed test.
Set environment variable ``ROBOTSUITE_RETRY_COUNT=X``.
Or override this by passing ``retry_count=X`` to a ``RobotTestSuite`` call.
Default is zero: no retries. The retry count *excludes* the original try.
[maurits]

- Add support for Robot Framework 3.2b1
[datakurre]

- Drop robotframework-python3 requirement,
robotframework itself is already python 3 compatible.
[gforcada]

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- Do not support python 2.6 anymore
[gforcada]

- Remove unittest2 references
[gforcada]

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- Add support for Robot Framework 2.9
[datakurre]

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- Add ROBOTSUITE_LOGLEVEL environment variable for filtering text execution
errors during log merge
[datakurre]

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- Add support for ROBOTSUITE_PREFIX-env for injecting custom string into all
robotsuite test names
[datakurre]
- Add UTF-8 support for robot variables [6]
[Tom Gross]
[Vincent Fretin]
- Added Python 3.4 support
[Vincent Fretin]

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- Restore original behavior to override the exiting robot_output.xml. Set
environment variable ROBOTSUITE_APPEND_OUTPUT_XML=1 to append test results to
the existing robot_output.xml.
[datakurre]