reworked pull request #13 to fit plugin coding standard
Documentation is updated
Fixed the issue with deactivating plugin for several windows (Issue #11)
Ignore list added to let user to configure file types not to be checked
Events listening changed for correct handling of ignored files
Documentation is updated
Fixed incorrect highlighting after split (Issue #14)
Highlighting of control characters implemented (Issue #12)
fix for 'function already exists' (issue #17)