leebem väljade kontroll Timex klassi tegemisel
Merge branch 'master' of github.com:tpetmanson/estnltk

* 'master' of github.com:tpetmanson/estnltk:
  TimexTagger: method for removing timexes with no value or type specified.
  Update README.md
  Updated documentation for featurextractior.
  Updated documentation
  fixed a typo
  Updated documentation of the verb chain detector.
  Updated (the source of) documentation on verb chain detector, timex tagger, clause segmenter.
  Tiny bugfix (for some clause-final verb chain members that were left undetected)
  Updated timex tagger's Python interface and corresponding documentation.
  Updated documentation for clause segmentation and timex tagging.