Exposes in API the Repo entity's Size and Isempty properties (#64)

* Exposes in API the Repo entity's Size and Isempty properties

* Add new field "Empty" to Repository structure
* Fix Empty type to bool
* Add Size property to Repository structure

Signed-off-by: Guyzmo <guyzmo+github+pub@m0g.net>

* Added Parent property to the repo API

Signed-off-by: Guyzmo <guyzmo+github+pub@m0g.net>

repo.go

@@ -27,6 +27,9 @@ type Repository struct {
 	Description   string      `json:"description"`
 	Private       bool        `json:"private"`
 	Fork          bool        `json:"fork"`
+	Parent        *Repository `json:"parent"`
+	Empty         bool        `json:"empty"`
+	Size          int         `json:"size"`
 	Mirror        bool        `json:"mirror"`
 	HTMLURL       string      `json:"html_url"`
 	SSHURL        string      `json:"ssh_url"`