Replace godep with dep

vendor/github.com/go-openapi/spec/ref.go

@@ -55,7 +55,7 @@ func (r *Ref) RemoteURI() string {
 }
 
 // IsValidURI returns true when the url the ref points to can be found
-func (r *Ref) IsValidURI() bool {
+func (r *Ref) IsValidURI(basepaths ...string) bool {
 	if r.String() == "" {
 		return true
 	}
@@ -81,14 +81,18 @@ func (r *Ref) IsValidURI() bool {
 	// check for local file
 	pth := v
 	if r.HasURLPathOnly {
-		p, e := filepath.Abs(pth)
+		base := "."
+		if len(basepaths) > 0 {
+			base = filepath.Dir(filepath.Join(basepaths...))
+		}
+		p, e := filepath.Abs(filepath.ToSlash(filepath.Join(base, pth)))
 		if e != nil {
 			return false
 		}
 		pth = p
 	}
 
-	fi, err := os.Stat(pth)
+	fi, err := os.Stat(filepath.ToSlash(pth))
 	if err != nil {
 		return false
 	}
@@ -116,25 +120,18 @@ func NewRef(refURI string) (Ref, error) {
 	return Ref{Ref: ref}, nil
 }
 
-// MustCreateRef creates a ref object but
+// MustCreateRef creates a ref object but panics when refURI is invalid.
+// Use the NewRef method for a version that returns an error.
 func MustCreateRef(refURI string) Ref {
 	return Ref{Ref: jsonreference.MustCreateRef(refURI)}
 }
 
-// // NewResolvedRef creates a resolved ref
-// func NewResolvedRef(refURI string, data interface{}) Ref {
-// 	return Ref{
-// 		Ref:      jsonreference.MustCreateRef(refURI),
-// 		Resolved: data,
-// 	}
-// }
-
 // MarshalJSON marshals this ref into a JSON object
 func (r Ref) MarshalJSON() ([]byte, error) {
 	str := r.String()
 	if str == "" {
 		if r.IsRoot() {
-			return []byte(`{"$ref":"#"}`), nil
+			return []byte(`{"$ref":""}`), nil
 		}
 		return []byte("{}"), nil
 	}