Custom logging

Support for CocoaLumberjack framework
Update .gitignore
Nonatomic properties
Xcode auto-synthesize properties

From version 4.4 Xcode auto-synthesizes property, @synthesize is no
longer required
Set connected flag to NO when disconnect
Port property
Connection timeout
Delegate and disconnection callback
Support for keyboard-interactive authentication method

Don't forget to set the delegate!
Updated README to reflect API changes
Exec commands with timeout
Merge Frugghi/master