Database and settings are now integrated into the bot class. Reformatted some code.

 * Markovirc is now a class that extends Cinch::Bot
 * bot.exec is a new function which allows postgres db queries with sqlite syntax (ish)
 * bot.set and bot.db are the old $set / $db respectively.
 * Reorganized includes in the main config to remove the need for separate db / settings variables.
 * Started the purging of sqlite3.