Add parsing of ditransitive verbs as is possible now

The filtering og valid nouns is now needed

Squashed commit of the following:

commit 57ff0a229a86a61e3653744dd9e877d7a0061aa2
Author: mbuechmann <malte.buechmann@gmail.com>
Date:   Tue Sep 16 22:50:41 2014 +0200

    Add first step of parsing of ditransitive verbs in the form <verb> <indirect object> <direct object>

    The filtering of valid nouns is now needed

commit 70aac9c45d089652881b17072064ac51be86d889
Author: mbuechmann <malte.buechmann@gmail.com>
Date:   Tue Sep 16 07:24:49 2014 +0200

    Remove obsolete specs

commit 387b661a6f340a9275011bda500ebbb03b321776
Author: mbuechmann <malte.buechmann@gmail.com>
Date:   Tue Sep 16 07:21:37 2014 +0200

    Add parsing of ditransitive verbs in the form <verb> <direct object> <preposition> <indirect object>

commit 8ed9f9b89b088f6f99a7767e2c5a3cd04cf94881
Author: mbuechmann <malte.buechmann@gmail.com>
Date:   Sun Sep 14 21:03:22 2014 +0200

    Add shell for ditransitive verb
Move verb extraction to VerbParser: