Reporting for OS version for Windows and OS X by overriding the user …

[loonychewy]

…agent

• Implemented using a mixture of code from the following sources
• Add definition for user agent override field. #78
  1.1 For user agent override
• Platform / Operating System detection for OS X / Windows / Linux #94
  2.1 For the user agent string for Windows and OS X.
  2.2 Includes a bit of extra code to fix a bug in Unity 4.6 where it reports Windows 10 as Windows 8.1 (6.3.10XXX), where the build number is correct

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[loonychewy]

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