add backboneconf

[A]

Чтобы не забыть: http://backboneconf.com/2013/

[denji]

• https://github.com/RichardLitt/awesome-conferences
• https://gist.github.com/maxogden/322a649ff84fe1c2a680
• https://gist.github.com/dxnn/55ebf7363cc5bcc7677b
• http://gdg.org.ua/ ( https://github.com/GDG-Ukraine/ )
• https://github.com/foru17/front-end-collect
• http://gdg.org.ua/ ( https://github.com/GDG-Ukraine/ )
• http://webnextconf.eu/
• http://frontenddesignconference.com/