added model to store lexical parsing for document sentences
added preprocess step for lex parsing using nltk
added basic visualization for parsed trees
hydrating lex trees for segments
placeholder for some grammar features
adding some draft on lexical features
changed implementation of grammar trees to use corenlp
added check for parsed sentences
changed name to syntactic parsing
added factory for syntactic parsed document
added tests for syntactic parsing
fixed tests broken by the syntactic parsing step
adding lemmas to the evidence factory
added test of a feature that uses lemmas
added support for syntactic sentence in an evidence test
added test for syntactic sentence feature
added documentation about the syntactic sentences
added one more feature test example
added note about the older versions
Merge branch '408-add-lex-parsing' into develop