$ pattern capability to data_config.yml too!

Hi,

I was testing the YAML config files and saw I couldn't declare variables and access them within these files. Then I found out you were doing it in the config.yml, but not in the data_config.yml, for no clear reason.

I modified the utils folder so I could use the ($) pattern to access variable values withing the data_config.yml file too.

Cheers,
Alex