perf(barcode): use elaphe library to generate barcodes#90

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fedexin40 wants to merge 3 commits intoaeroo:8.0from

OpenPymeMx:barcode

Commits on Aug 23, 2016

perf(barcode): use a better python library to generate barcodes
federico
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Commits on Aug 24, 2016

perf(remove unused code): this code is not necessary due to elaphe library is replacing the functio
federico
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perf(__openerp__.py): elaphe as external dependency
federico
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