Refactor parse_json_data in synset_detection.py
new method find_synsets for finding all synsets on tags of picture
Merge branch 'master' into tags_not_in_wordnet
Kepp tags which WordNet don't find in separate list: unmatched_tags
Create tag_synset_co_occurrence_dict in symantic_clustering.py
Adding tf_idf calculation for unmatched_tag_co_occurrence_dict in semantic_clustering.py
Fix tf calculation
max_co_occurrence wasn't set to zero each iteration
Add create_dict_files.py for precalculated lookup dicts
and adapt semantic_clustering and synset_detection
Merge branch 'master' into tags_not_in_wordnet

Conflicts:
	semantic-clustering/synset_detection.py