Add updated CocoaPods spec for 0.9.5.
user
```ruby
Pod::Spec.new do |s|
  s.name     = 'BlocksKit'
  s.version  = '0.9.5'
  s.summary  = 'The Objective-C block utilities you always wish you had.'
  s.homepage = 'https://github.com/zwaldowski/BlocksKit'
  s.author   = { 'Zachary Waldowski' => 'zwaldowski@gmail.com'}
  s.source   = { :git => 'https://github.com/zwaldowski/BlocksKit.git', :tag => 'v0.9.5' }

  s.source_files = 'BlocksKit'

  s.frameworks = 'MessageUI'

  s.requires_arc = true

  s.clean_paths = 'BlocksKit.xcodeproj/', 'GHUnitIOS.framework/', 'Tests/', '.gitignore'

  def s.post_install(target)
    prefix_header = config.project_pods_root + target.prefix_header_filename
    prefix_header.open('a') do |file|
      file.puts(%{#ifdef __OBJC__\n#import <dispatch/dispatch.h>\n#import "BlocksKit.h"\n#endif})
    end
  end
end
```
assistant