Overview of changes in 3.17.2
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* Foursquare is enabled by default

* Remove Yahoo! support (721061)

* Bugs fixed:
 710764 live: "Microsoft Account" is the common parlance nowadays and new icons
 739593 Separate identity service off into its own process
 739594 kerberos: Support refreshing smartcard authenticated kerberos tickets
 742680 Port to WebKit2