Read an existing Data Package descriptor

[loleg]

The Data Package metadata is stored in a "descriptor". This descriptor is what makes a collection of data a Data Package, and can be read from a dictionary or JSON object (e.g. file). See full specification for details and datapackage.json for a validation schema.

• [ ] Standard parts of the descriptor are validated on loading.
• [ ] Errors from validation are handled in a standard way.
• [ ] Resources are loaded (validation will be done later).
• [ ] Tests cover the basic descriptor design and reading scenarios.

[roll]

@loleg Hi, can we close this?

[loleg]

@roll I'd like to (see someone) do some additional testing before ticking off those boxes - especially since Julia has come quite a few versions forward since the alpha release.

[roll]

@loleg I would rather close if it's done and react on bug reports. But whatever works better for you