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Merge pull request #27 from webpro/patch-1

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Fix finer-grained feature detection example in README.
Shim defineProperty and getOwnPropertyDescriptor in IE8 and fallback to native method when it is working against dom element
Merge pull request #18 from troopjs/dev

Shim Object.getOwnPropertyDecriptor and Object.defineProperty in IE8
Minor reformatting.
Serious code cleanup and prevent IE8 from falsely failing some tests.
Convert to UMD