Merge pull request #15 from mrh-is/master

Remove extra *
SecondConf added
JailbreakCon added
WWDC announced! and some dates updated
Correct WWDC date
Merge pull request #16 from brunokoga/patch-1

Correct WWDC date
AltConf added
Merge pull request #5 from Lascorbe/master

Merge Lascorbe/CocoaConferences