Improvements in unit and acceptance tests runner and test server #695

On PR #694, we fix running acceptance tests on Windows with Chrome. It requires code review to be PEP8 compliant.
On PR #693, we fix running unit tests in an dependable way from the language binding (i.e. Python 2.7, Jython). I will add one more commit to make it truly compatible with Python versions, 2.7, 3.4, 3.5,...