gibberbot: the fingerprint is also now all lower case
gibberbot: only include XMPP private keys in otr_keystore

 avoid spreading the other private keys around needlessly
gibberbot: read file from --output-folder, and warn if its not present
libotr: match exact spacing of otr.private_key for easy comparison
pidgin: added example ~/.purple/accounts.xml
pidgin: added resource name to one of the test accounts
pidgin: look up XMPP-Resource to include in otr.private_key 'name' field (closes #11)

Pidgin uses the XMPP Resource as part of the account name for OTR private
keys.  This patch takes the XMPP account name, and uses that to find the
XMPP Resource that Pidgin associates with that account, so the account can
be properly written out in otr.private_key.
gajim: added very basic example files