Roadmap for version 4.X

[greeny]

• use Nette coding style
• rename namespace to greeny\MailClient PhpMailClient
• remove occurences of $this->mailboxes || $this->initialize() and similar, replace with standart if
• merge Bug fixes #13 and [WIP] Experimental fixes #14 or use parts from them
• write unit tests
• test different mail providers for differences in server communication
• replace Contact and ContactList with some external service, like ContactParser
• make ContactParser independent on imap_* functions
• remove Selection::mailIndexes (use native ArrayIterator)
• try refactor Mail to split from Connection (Doctrine-like access)
• SocketDriver