Update AZSocketIO.h

Not compile under a case-sensitive file system.
Ensure event block processing loop is done with a copy of the NSMutableArray of callback blocks to avoid a crash if the array is mutated during enumeration.
Merge pull request #23 from undancer/patch-1

Update AZSocketIO.h
Merge pull request #24 from chrisgummer/feature/callback-crash

Ensure event block processing loop is done with a copy of the NSMutableArray of callback blocks to avoid a crash if the array is mutated during enumeration
Merge pull request #1 from pashields/master

update