Added implementation for layout version 8.3
Add number of registrations in batch trailer
Add explicit version when loading from file
Accept both file name and file object when loading from file
Implemented segments z and j for v83
Merge pull request #1 from sumup/brazil

Brazil - passed review.
Don't use git in gem building
Ignore unknown segments
Merge pull request #2 from sumup/features/ignore_unknown_segments

Ignore unknown segments
Fix test
Merge remote-tracking branch 'sumup/master'

Conflicts:
	lib/cnab240/arquivo/arquivo.rb
	lib/cnab240/arquivo/builder.rb
	lib/cnab240/arquivo/estrutura.rb
	lib/cnab240/arquivo/lote.rb
	lib/cnab240/ext/bindata.rb
remove whitespaces and tabs after merge

* format code
add spec for layout v83

* normalize specs to use same flow