Report possible keywords

[zdne]

For example in

# Resource [/]
+ Model
    + Body (application/json)

            { ... }

The + Body (application/json) is not recognized as a body (content type should be defined on the model level) and thus the whole list item is considered to be model's description.

[zdne]

refer to #31

[abtris]

Migrated to apiaryio/drafter#645