Add links to Appium.app and Appium.exe in intro document.
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Added missing newlines to end of docs files.
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Updated required node.js version to 0.10 (based upon information in README).
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Updated references from iOS 6.1 to iOS 7.1 and references from Android 4.2 to Android 4.4.
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Merge pull request #2726 from edgy360/master

Update version numbers and newlines in docs