Implementing both feature #81 and #61

Implemented #81 and #61 
Then, the wording in the README is not OK:

*All CKAN resource IDs belong to the same <b>datastore (also referred as package</b> in CKAN terms)*

I.e. datastore == package

And you say *Regarding default_dataset vs. default_package both terms are used in CKAN* as well.

I.e. dataset == package

Thus, transitive relation says dataset == package == datastore :)