added Carthage support

Cartfile

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+github "robbiehanson/CocoaAsyncSocket" >=7.4.2

Cartfile.resolved

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+github "robbiehanson/CocoaAsyncSocket" "7.4.2"

Carthage/Checkouts/CocoaAsyncSocket/.gitignore

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+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## Build generated
+build/
+DerivedData
+
+## Various settings
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata
+
+## Other
+.DS_Store
+*.xccheckout
+*.moved-aside
+*.xcuserstate
+*.xcscmblueprint
+
+## Obj-C/Swift specific
+*.hmap
+*.ipa
+
+# CocoaPods
+#
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# http://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
+#
+Pods/
+
+# Carthage
+#
+# Add this line if you want to avoid checking in source code from Carthage dependencies.
+# Carthage/Checkouts
+
+Carthage/Build

Carthage/Checkouts/CocoaAsyncSocket/.travis.yml

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+language: objective-c
+osx_image: xcode6.4
+
+before_install:
+  - gem install cocoapods --no-rdoc --no-ri
+
+install:
+  - pod install --project-directory=./Tests
+
+script:
+  - xctool -workspace ./Tests/CocoaAsyncSocket.xcworkspace -scheme CocoaAsyncSocketTestsiOS -sdk iphonesimulator -arch i386 test
+  - xctool -workspace ./Tests/CocoaAsyncSocket.xcworkspace -scheme CocoaAsyncSocketTestsMac -sdk macosx -arch x86_64 test
+  - xctool -project CocoaAsyncSocket.xcodeproj -scheme "iOS Framework" -sdk iphonesimulator -arch i386 build

Carthage/Checkouts/CocoaAsyncSocket/CocoaAsyncSocket.podspec

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+Pod::Spec.new do |s|
+  s.name     = 'CocoaAsyncSocket'
+  s.version  = '7.4.2'
+  s.license  = { :type => 'public domain', :text => <<-LICENSE
+Public Domain License
+
+The CocoaAsyncSocket project is in the public domain.
+
+The original TCP version (AsyncSocket) was created by Dustin Voss in January 2003.
+Updated and maintained by Deusty LLC and the Apple development community.
+                 LICENSE
+               }
+  s.summary  = 'Asynchronous socket networking library for Mac and iOS.'
+  s.homepage = 'https://github.com/robbiehanson/CocoaAsyncSocket'
+  s.authors  = 'Dustin Voss', { 'Robbie Hanson' => '[email protected]' }
+
+  s.source   = { :git => 'https://github.com/robbiehanson/CocoaAsyncSocket.git',
+                 :tag => "#{s.version}" }
+
+  s.description = 'CocoaAsyncSocket supports TCP and UDP. The AsyncSocket class is for TCP, and the AsyncUdpSocket class is for UDP. ' \
+                  'AsyncSocket is a TCP/IP socket networking library that wraps CFSocket and CFStream. It offers asynchronous ' \
+                  'operation, and a native Cocoa class complete with delegate support or use the GCD variant GCDAsyncSocket. ' \
+                  'AsyncUdpSocket is a UDP/IP socket networking library that wraps CFSocket. It works almost exactly like the TCP ' \
+                  'version, but is designed specifically for UDP. This includes queued non-blocking send/receive operations, full ' \
+                  'delegate support, run-loop based, self-contained class, and support for IPv4 and IPv6.'
+
+  s.source_files = 'Source/{GCD,RunLoop}/*.{h,m}', 'Source/CocoaAsyncSocket.h'
+
+  s.requires_arc = true
+
+  # dispatch_queue_set_specific() is available in OS X v10.7+ and iOS 5.0+
+  s.ios.deployment_target = '5.0'
+  s.osx.deployment_target = '10.7'
+
+  s.ios.frameworks = 'CFNetwork', 'Security'
+  s.osx.frameworks = 'CoreServices', 'Security'
+end