Support for default endpoints

[klmitch]

Provide support to have default tenant endpoints.All the tenants that are created would be mapped to deafult baseurs that are marked as default.

[klmitch (q-noreply)]

BasURL would have a flag called default.When this flag is set to be true tenants that are getting created would automatically get these urls as their reference by default.In case tenant doesn't want the default, they are still free to go and delete the existing references and create new references.
My only contention is for someone making the call this is like a hidden information.He is attempting to create a tenant and has not passed any baseurl for the tenant during the create call.That seems non RESTful to me.
Also should we make tenant creation calls heavy.Ie giving the option of passing the references in case they want to override defaults?
 Ziad could you let me know that this is how you wanted.I shall start working on it.

[klmitch (q-noreply)]

Also let me know the names that makes sense to all of you.I shall start working on it.Iam fine either ways as long as the public calls remains to have service catalog and endpoints.

[klmitch (q-noreply)]

@yogi - I expanded on this in #51. Sorry for the duplication.

 1. I documented the rename we were discussing in #50.

 2. I'm not sure which use case will be the most common. I can see different back-end stores supporting or preferring one over the other. So maybe we create those attributes (`global` and `default` as extensions on endpoint-templates).