* updated run_timeit_tests
* updated setup.cfg and setup.py for new version
* minor performance improvements by using collections.deque for children
* performance improvements by using more duck-typing and less instanceof checks
* more duck-typing for less instanceof
* more performance improvements by using alternatives to isinstance
* documentation updates
* updated README.md for new release and with interpretation of latest benchmarks
* PyXOM output now tests for the attribute '_IS_PYXOM_NODE' being True for better performance
* updated performance test results
* fixed text handling for ecoxipy.etree_output.ETreeOutput
* added ElementTree performance tests
* fixed ecoxipy.etree_output again
* minor fixes and modifications
* optimizations in ecoxipy.etree_output
* fixed ecoxipy.parsing.MarkupHandler to use collections.deque
* updated "README.md"
* updated performance test results
* minor updates, fixes and modifications to documentation
* fixes and tweaks in documentation
* rolled back change to ecoxipy.etree_output.ETreeOutput.is_native_type
* removed "dev" build tag