Added code to build_phrasal_thesauri_offline.py to do Baroni-style noun-noun compound composition, along with changes to the rest of the code that were required. Also fixed bugs in vectorstore.py: 1) BaroniComposer._get_vector did not work when the entry index has document features (introduced yesterday) and 2) populate_vector_space used to include phrases in the entry index even if no vectors were available for these entries.
Minor tweak to formatting functions in composers/utils.py to account for the fact that the NN training data (observed vectors) is in a different format compared to the AN data