Added CocoaPods support

LICENSE

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+Copyright (c) 2013 Zhigang Fang
+
+Permission is hereby granted, free of charge, to any person obtaining
+ a copy of this software and associated documentation files (the "Software"),
+ to deal in the Software without restriction, including without limitation
+ the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ and/or sell copies of the Software, and to permit persons to whom
+ the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH
+ THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

ZGParallelView.podspec

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+Pod::Spec.new do |s|
+  s.name         = "ZGParallelView"
+  s.version      = "0.0.1"
+  s.summary      = "ZGParallelView is the easiest way to add a Parallax effect to a UITableView."
+  s.homepage     = "https://github.com/zhigang1992/ZGParallelView"
+  s.license      = { :type => 'MIT', :file => 'LICENSE' }
+  s.author       = { "Zhigang Fang" => "zhigang1992@gmail.com" }
+  s.source       = { :git => "git@github.com:zhigang1992/ZGParallelView.git", :tag => "v0.0.1" }
+  s.platform     = :ios
+  s.source_files = 'Class', 'Class/**/*.{h,m}'
+  s.public_header_files = 'Class/**/*.h'
+  s.requires_arc = true
+end