Fix link href in ListArticleTranslation response
Improve inheritance of model properties

Add to the ServiceDescriptionLoader to ensure that models which inherit
from another model (where both models have properties) correctly
inherit both their own properties and those from their parent model,
rather than just their own.
Delete old Relationship plugin
Add Model
Add CommandBuilder to create commands out of links
Add ResponseVisitor base class
Add LinksVisitor response visitor
Add EmbeddedCommand
Add ModelBuilder
Add EmbeddedVisitor
Add ResponseParser
Add Relationship Plugin
Add base Create operation
Improve consistency of parameter definitions

- Settle on a consistent order for the attributes inside parameters
- Use "extends" instead of "$ref" to refer to and inherit models
- Remove "foo.json" and "bar.query" models, put location in parameters
Separate model parameters into separate models
Use new-style link descriptions
Update project progress in README
Merge pull request #21 from bradfeehan/relationships

Improved relationship plugin