Changes:
- Added Big Picture mode which is optimized for using Steam fullscreen with a Gamepad on HDTVs
- Games managed by the new content system can select alternate installation locations other than the Steam folder (Windows)
- Fixed the in-game overlay not recognizing correctly which game is running sometimes when running a non-Steam shortcut
- Fixed some potential GDI handle leaks in the Steam client (Windows)
- Fixed Steam Cloud occasionally not syncing files it should
- Fixed a bug where entering a password-protected content beta without a password would act like it succeeded even though it hand’t
- Improved TGA validation in image loading code
- Improved steam:// URL validation in some cases
- Fixed a new in-game overlay crash in very specific scenarios on Windows 8 with legacy DX9 games
- Fixed problems uppercasing some characters (e.g. Greek terminal sigma)
- Fixed error retrieving third party cd keys when launching games on OS X (OSX)
- Fix the in-game overlay to correctly inject when a launcher calls ShellExecute with an empty string for the verb (Windows, fixes SWTOR)
- Improvements to the change email wizard

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