Write new plugin that checks if one of irc_nick, twitter, email or phone is defined in keymasters

[slopjong]

The new structure for keymasters is:

    "keymasters": [
        { "name": "Ass Def", "phone":"123", "irc_nick": "asdf", "email": "[email protected]", "twitter": "@asdf"}
    ],

Check for the presence of at least one field of

• phone
• irc_nick
• asdf
• email

Related #79 issue.