Brazilian Portuguese translation.

By José Inácio Serafini and Leonardo Siqueira Rodrigues.
Added it version of history.txt
Fixed some typos in it version of branch.txt
Fixed some minor typos in it/clone.txt
Fixed some minor typos in it/basic.txt
Fixed some minor typos in it/intro.txt
Fixed some minor typos in it/translate.txt
Added it/multiplayer.txt
Added it/grandmaster.txt
Added it/secrets.txt
Added it/drawbacks.txt
Mention on it version in de, en, fr versions
Merge branch 'master' of https://github.com/matrig/gitmagic

Conflicts:
	en/preface.txt