Master password branch integration - ready for a review

[Tomasz Wasilczyk]

Hi,

I've been working on master password branch integration recently and I
think, it's now ready to present. All details are published on my blog
[1], together with source packages for Linux and installation file
ready to run under Windows OS.

I would really appreciate any feedback, code review and comments. I
also ask you for reviewing English messages, by searching for
"/keyring.c" and "/keyrings/" phrases in pidgin.pot [2] file.

Waiting for a feedback,
Tomek

[1] http://blog.wasilczyk.pl/en/2013/password-safe-support/
[2] http://blog.wasilczyk.pl/wp-content/uploads/2013/05/pidgin-masterpassword-pot.txt