Adicionado código para cancelar nota eletronica
[NEW] Implementado metodo de cancelamento online
Merge branch 'develop' into feature/cancelamento

Conflicts:
	nfe/sped/nfe/processing/xml.py
Merge remote-tracking branch 'upstream/feature/cancelamento' into feature/nfe_cancel

Conflicts:
	nfe/sped/nfe/processing/xml.py
[NEW] Implementação cancelamento online nfe
[NEW] Cancelamento da fatura apos cancelamento no sefaz
[NEW] Registro no l10n_br_account.invoice.cancel
Merge branch 'feature/nfe_cancel' of git://github.com/kmee/nfe into kmee-feature/nfe_cancel

Conflicts:
	nfe/__openerp__.py
	nfe/account_invoice.py
	nfe/account_invoice_view.xml
	nfe/sped/nfe/processing/xml.py
	nfe/wizard/__init__.py
[FIX] Correção e melhorias na descrição dos eventos
Merge branch 'kmee-feature/nfe_cancel' into develop
Merge branch 'develop' of https://github.com/odoobrasil-fiscal/nfe into develop

Conflicts:
	nfe/account_invoice.py
	nfe/account_invoice_view.xml