Replaced word ligatures by correct characters

The original document was created using Microsoft Word.
Taht's why some words contained ligatures joining two
characters. Example: "deﬁnition" instead of "definition"
Merge pull request #5 from javiereguiluz/fix_word_ligatures

* javiereguiluz/fix_word_ligatures:
  Replaced word ligatures by correct characters
Replace n-dash with double dash.
Replace all special spaces with standard spaces.
Replace m-dash with simple dashes.
Replace ellipsis by three dots.
Remove 'fl' ligature.
Replace special double quotes by standard double quotes.
Replace special simple quotes by standard simple quotes.
Replace array character by ->.