Adjusts in cover and more translation work

This pull contains:
1) A revised build to properly acess the bibliography in the localized scala-by-example build
2) A translated by optional command in scaladoc.sty
3) Adjusts in covers to keep looking nice due to change in scaladoc.sty
4) Fix of typo in build documentation structure
5) Fix of typo in English ScalaByExample book
6) Translation of chapters 1->8 and 12->15 to Brazilian Portuguese.
Hope to get with translation of  9,10, 11, 16 and 17 soon.