scope=given not fully working

[matteo-cristino]

I noticed some problem with the scope=given configuaration

1. When picking something from an object that does not exists:

   Given I have a 'string' named 'str' in 'obj'
   Then print the data

   or similar when searching it under my name that is not explicitly define in the zencode

   Given my name is in a 'string' named 'name'
   and I have my 'string' named 'str'
   Then print the data

   In particular, in the latter case, if name is not specified should we add a key to the codec, e.g. my_name=true, to let the code that read the output know that that varibale is its name? Moreover the variables loaded with Given I have my should have another value in the codec, e,g. my_variable=true to let the code that read the output to know that this variable should be inside the object named by the name?
2. rename a variable

   Given I have a 'string' named 'str'
   and I rename 'str' to 'str_string'
   and I have a 'base64' named 'str'
   Then print the data

   at the moment this fails beacuse str is not found, but if the rename part is allowed then we will end with two different variable in the codec, but only one is required as input. How should we handle this?