Added support to the repetitions module for Spanish
- List of inflections of the verbs "to be" and "to have"
  have to be updated for Spanish
- Added Spanish support for the ratio_to_passive_verbs module.
Added support for the Spanish syllable_ratio module
Added support for the Spanish average_pmi module
Added support for the mean_word_rank module.
    -  TODO: update word_ranks.py  with Spanish words.
Corrected help message when choosing module to use
Added command line option parsing for variants of modules.
Set default command line options to:
    - Input language  : Spanish
    - Input format    : FreeLing
    - Default display : STDOUT (no GUI)
Added TODO file
Updated TODO file