Add iRate with tag 1.5.2

iRate/1.5.2/iRate.podspec

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+Pod::Spec.new do |s|
+  s.name     = 'iRate'
+  s.version  = '1.5.2'
+  s.license  = 'zlib'
+  s.summary  = 'A handy class that prompts users of your iPhone or Mac App Store app to rate your application after using it for a while. Similar to Appirater, but with a simpler, cleaner interface and automatic support for iOS fast application switching.'
+  s.homepage = 'http://charcoaldesign.co.uk/source/cocoa#irate'
+  s.author   = 'Nick Lockwood'
+  s.source   = { :git => 'https://github.com/nicklockwood/iRate.git', :tag => '1.5.2' }
+  s.source_files = 'iRate/iRate.{h,m}'
+
+  s.resources		= 'iRate/iRate.bundle'
+end