by AndyF: add tests for percentage coupons
Issue #1882828 by lotyrin, AndyF: automate installation
Issue #1919384 by TomTech: Remove Features dependency
Issue #1882820 by lotyrin: Repackage with other coupon modules
by AndyF: rules.inc line endings DOS -> UNIX
Issue #1787902 by AndyF: properly check entity metadata wrapper before dereferencing.
Issue #1377318 by AndyF: rolled all rules functionality into this module.
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