>
The Pod modules name-spaces all the classes of CocoaPods.
_eval_podspec
_eval_podspec(string, path) #=> Object 
String  string
The string containing the Ruby description of the Object to evaluate.
Pathname  path
The path where the object to evaluate is stored.
Object 
It can return any object but, is expected to be called on
podspec files that should return a #{Specification}.
606 def self._eval_podspec(string, path)
607   begin
608     eval(string, nil, path.to_s)
609   rescue Exception => e
610     raise DSLError.new("Invalid `#{path.basename}` file: #{e.message}",
611                        path, e.backtrace)
612   end
613 end