XKNX / xknx / 397

95%

Pull #82

travis-ci

Implemented is_group() to avoid many potential wrong isinstance() calls.

isinstance() as the only check if a object is an valid/possible knx group
is wrong, at least booleans are integers, but never valid knx groups.

Later we should to much more validation, but for now it fixes some possible
issues related to input validation.

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