Fix #158, mod unicodeEscape func, adds comments

Modifies the unicodeEscape function. The function is now fully
tested, overrides the initial .nt files if there are any inside
the folder. If another code puts files in the respective folders
this script overrides these files and run the unicodeEscape.py
script.
  - Adds a commentary saying where the unicodeEscape.py script is
  called.
  - Forces override of the initial decompression of the .bz2 files.

Adds two commentaries in the beginning of the script.
  - States what path is a Windows path example and what path is a
  Linux path example.

Removes two messages from regarding GitHub downloads.
  - Removes the stopwords.list and the blacklistedURIPatterns.<lang>.
  list related download message saying that the URL linked directly
  to the pt version.