Merge pull request #6 from mrh-is/master

Confirm NSNorth 2014 dates
New list, dates updated and, AppsWorld & Mobile March added

New list: The list was separated into 2 lists, 1 for cocoa-only conferences and other for mobile in general or interesting for cocoa devs.
Typo fixed
New conference: ValioCon

A Conference for Designers & Makers
Merge pull request #1 from Lascorbe/master

New list for general mobile conferences