Version 2.2.1 Prerelease

This release contains some fixes over the previous prerelease. A huge thanks to everyone who`s been reporting bugs and raising pull requests! Some features (such as services) have not yet made it into the release channel and continue to be prerelease only.

• Upgraded electron to 1.6.1
• Upgraded other libraries
• Fixed crash on exit (osx)
• Proxy server now automatically uses the same configuration as chrome, so unread counts and notifications should just work without any proxy configuration
• Removed DOM scraping from Google Inbox, but replaced it with a better API query that should provide better notifications and unread counts
• Clicking the tray icon on windows now focuses the WMail window
• Opening a mailto link now makes sure the WMail window is focused when using multiple desktops
• Relaxed the version requirements for libappindicator1 for linux distributions that still use version 4.*.*
• Removed the long description for sub-processes on windows
• Added Google Hangouts service (Thanks to @inikolaev for the pull request)
• Added Cmd+Ctrl+{ and Cmd+Ctrl+} global shortcuts to switch accounts in a similar way to chrome (Thanks to @theRealWardo for the pull request)
• Added some more information to the sleepable settings to make it clearer what they do (Thanks to @gkatsev for the pull request)
• Added WMail News