Added enum_matrix, in the process of optimizing for better speed.
Modified enum_matrix indices.
Optimized enum_matrix and enum_sort.
Merge branch 'zip-optimization' of github.com:inpho/vsm into zip-optimization
Bug fix in enum_matrix.
Bug fixed in enum_matrix.
Working on sim_word_word and some other functions.
Optimized functions in similarity and ldagibbsviewer.
Merge branch 'zip-optimization' into develop