gpg: store files for secret and public keys in standard field

refs #1872
gpg: added my key to the public keyring as a test of multiple keys
add duplicate public keys to check conflict handling

This includes some IDs with different keys, and the same key used in
different IDs.
simple MTP test will only run on Mac OS X for now, where pymtp is required
add GnuPG logo from GPGTools (GPLv2+)

https://github.com/GPGTools/pinentry-mac/blob/75e8aa8b36b60fd075e9556bfbb5ec985faddb00/logo.png
gpg: convert keydict to standard format and add fingerprint

refs #1872
adium: add whole settings tree for reference, using the full path from ~/

This is the whole Adium settings folder that was created from a blank user
account, then used to do a couple of quick OTR things.
readme: reference windows build instructions

also change ~/ -> %APPDATA% for pidgin on windows