Added missing attr initialization (ConsoleWidget.history_index).
Without this initialization if the user press UP/Down keys and there the
ConsoleWidget._history still empty the ConsoleWidget fail until the user enter some command.
Merge branch 'console_history_index'
clean up pep8 violations.
remove pep8 violations
take out pep8 violations.
take out pep8 violations
take out pep8 violations
take out pep8 violations
take out pep8 violations
take out pep8 violations
take out pep8 violations
take out pep8 violations.
take out pep8 violations.
take out pep8 violations.
take out pep8 violations
take out pep8 violations
take out pep8 violations.
take pep8 violations
take out pep8 violations
take out pep8 violation