Moving old wordlist files into subdirectory
New wordlist files, already run through ftfy.

The procedure here was simply to load the wordlists via Wordlist.load() and
then save them via Wordlist.save(). The new files are generally larger than the
old ones because save() uses encoding utf-8. In some cases the files are fewer
lines; in loading the wordlists, I combined lines that
"preprocess_text(word).lower()" collapsed. (For instance, the old Arabic file
included "France,100.0" and "france,100.0"; the new file includes only
"france,200.0".)
Streamlining wordlist loading (to assume standardized files)

* wordlist.Wordlist.load(), as before, calls _load_stream(), but the latter is
  a much shorter function. Now, rather than taking into account two different
  modes (linear and logarithmic), it assumes that the file uses linear values;
  and instead of running the text through ftfy and lowercasing it, it assumes
  this has already been done and uses the text as is.

* wordlist.Wordlist now has, additionally, load_new(), which calls
  _load_new_stream(). The latter is the full function that was previously used
  in _load_stream(); the former opens a file provided, loads a wordlist from
  it, and saves it in standard format to the metanl data directory.
Forgot to remove the crucially expensive line
Merge pull request #1 from commonsense/faster-loading

Faster loading