[WIP] Profiles and validation

[dumyan]

This PR resolves frictionlessdata/datapackage-js#14 and resolves frictionlessdata/datapackage-js#13 but it's not quite there yet.

• [x] npm check for registry actuality
• [x] fully implement validation
• [x] Lint
• [x] Tests

@roll please review src/registry.js, src/utils.js, src/profiles.js and test/registry.js if any other additional things need to be implemented.

[roll]

@dumyan I've added a few comments (esp. important about Profiles-Registry merge). I'll check the PR in more details today.

[roll]

Also #13 means we need a simple wrapper datapackage.validate in public API (around Profiles.validate). It looks like just a few lines of code.

[dumyan]

@roll please review when you're able

[roll]

@dumyan is it ready for a review?

[dumyan]

@roll yes it is.