Fixed analyzer warning in AsyncUdpSocket.m

Fixed analyzer's 'possible leak' warning in -[AsyncUdpSocket
doReceive:] by using an NSData local variable instead of
theCurrentReceive->buffer to do the test of whether'buf' needs to be
freed.
GCDAsyncUdpSocket: fixed wrong condition for all methods that can be used in performBlock:

Fixes #211
fixed multicast operations for IPv6
Merge pull request #214 from MeckiCologne/master

fixed multicast operations for IPv6
Podspec updated to 7.3.4
GCDAsyncSocket: fixing -Wreceiver-is-weak warnings.

Fixes #206
Failing unit test to expose available space bugs in GCDAsyncSocketPreBuffer.
Fix GCDAsyncSocketPreBuffer availableSpace bugs that lead to access violation.

It's easy to see the bug by putting the read pointer slightly behind the
write pointer both near the end of the buffer.
Merge pull request #205 from talko/availspacebugs

Failing unit test and fix for buffer overrun access violation in GCDAsyncSocketPreBuffer.
Critical error when want connect to google.com xD
Merge pull request #217 from RogyMD/patch-1

Critical error when want connect to google.com xD
Bug fix for issue #146 - GCDAsyncSocket doesn't dealloc properly without disconnect call.
Bug fix for issue #102 - Stack overflow while writing data. Also addresses issue #115 & issue #216. Thanks to teerapap for the patch. (it's being used with the addition of an autoreleasepool)
Merge pull request #191 from karnevil9/master

Fixed analyzer warning in AsyncUdpSocket.m
Upgrading a few projects to latest Xcode recommended settings
Bug fix for issue #223 - Logging is hardcoded to off, so enabling it requires forking the repo
Merge branch 'master' of github.com:robbiehanson/CocoaAsyncSocket
Updated podspec to 7.3.5