Add ACL line to solve issue #96

Solves issue #96 (https://github.com/openlabs/magento_integration/issues/96) by adding a line to explicitly allow users in "base.group_sale_salesman" to access "model_product_price_tier".
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Merge pull request #218 from hack47/patch-1

Add ACL line to solve issue #96
Merge pull request #1 from openlabs/develop

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