translator from new-style to old-style recipe

[wolfv]

this would be useful for backward compatibility with conda-build

some work being done on an universal recipe reader is here: https://github.com/marcelotrevisani/souschef

[marcelotrevisani]

Any suggestions, improvements and PRs are welcome :) It is on early stage but I am trying to improve it each day, maybe in a couple weeks we will have something more stable