Fix IE7 and IE8 compatibility #50
Merged
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Commit 971a881 introduced a regression on Internet Explorer 7 & 8.
The Object.keys is not implemented on these browsers as described here: https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Object/keys
I replaced this ECMAScript 5th Edition function by a more classic style. It's been tested on Internet Explorer.
Both Coffeescript & Javascript files have been modified, no need to compile.