[Pidgin] #2790: msimprpl web challenge support

[Pidgin]

#2790: msimprpl web challenge support
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 Reporter:  jeff       |       Owner:  jeff 
     Type:  task       |      Status:  new  
 Priority:  major      |   Milestone:       
Component:  libpurple  |     Version:  2.1.1
 Keywords:  msimprpl   |     Pending:  0    
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 Reverse-engineer the webchallenge algorithm used to provide authentication
 to links opened from within MySpaceIM to the myspace.com website.

 Some documentation on the protocol messages is at MsimProtocolSpec, but
 finding the algorithm used to generate the challenge numbers (a sequence
 of digits, grouped by dashes) will likely require significant reverse-
 engineering.

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Ticket URL: <http://developer.pidgin.im/ticket/2790>
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