refactor  and bug fixes
 * simplified runner classes
 * WebPages are now created in same thread (bug when creating more pages in separate threads)
webkit service based on rpyc exposing WebPageStub and Node classes
refactorings and fixes:
 * no link delegation should be used
 * fix setAttribute bug
 * override and disable creation of plugins
 * change get/set methods to properties
 * specify Slot decorators when applicable
 * webpage close function implemented via capybara js
fix bug
embed registry server and subprocesses to implement webkit service pool.
remove obsolete files
distutils packaging