remove uri|datauri validation of buffer and image

struct.go

@@ -147,7 +147,7 @@ type Buffer struct {
 	Extensions interface{}            `json:"extensions,omitempty"`
 	Extras     map[string]interface{} `json:"extras,omitempty"`
 	Name       string                 `json:"name,omitempty"`
-	URI        string                 `json:"uri,omitempty" validate:"omitempty,uri|datauri"`
+	URI        string                 `json:"uri,omitempty" validate:"omitempty"`
 	ByteLength uint32                 `json:"byteLength" validate:"required"`
 	Data       []uint8                `json:"-"`
 }
@@ -702,7 +702,7 @@ type Image struct {
 	Extensions interface{}            `json:"extensions,omitempty"`
 	Extras     map[string]interface{} `json:"extras,omitempty"`
 	Name       string                 `json:"name,omitempty"`
-	URI        string                 `json:"uri,omitempty" validate:"omitempty,uri|datauri"`
+	URI        string                 `json:"uri,omitempty" validate:"omitempty"`
 	MimeType   string                 `json:"mimeType,omitempty" validate:"omitempty,oneof=image/jpeg image/png"` // Manadatory if BufferView is defined.
 	BufferView uint32                 `json:"bufferView,omitempty"`                                               // Use this instead of the image's uri property.
 }

validator_test.go

@@ -30,7 +30,7 @@ func TestValidateDocument(t *testing.T) {
 			Accessors: []Accessor{{ComponentType: Byte, Count: 1, Type: "SCALAR",
 				Sparse: &Sparse{Count: 1, Indices: SparseIndices{ComponentType: 1}}}}}, true},
 		{"Document.Buffers[0].URI", &Document{Asset: Asset{Version: "1.0"},
-			Buffers: []Buffer{{ByteLength: 1, URI: "http://[web].com"}}}, true},
+			Buffers: []Buffer{{ByteLength: 1, URI: "a.bin"}}}, false},
 		{"Document.Buffers[0].ByteLength", &Document{Asset: Asset{Version: "1.0"},
 			Buffers: []Buffer{{ByteLength: 0, URI: "http://web.com"}}}, true},
 		{"Document.BufferViews[0].ByteLength", &Document{Asset: Asset{Version: "1.0"},
@@ -96,7 +96,7 @@ func TestValidateDocument(t *testing.T) {
 		{"Document.Samplers[0].WrapT", &Document{Asset: Asset{Version: "1.0"},
 			Samplers: []Sampler{{MagFilter: MagLinear, MinFilter: MinLinear, WrapS: ClampToEdge, WrapT: 1}}}, true},
 		{"Document.Images[0].URI", &Document{Asset: Asset{Version: "1.0"},
-			Images: []Image{{URI: "http://[web].com"}}}, true},
+			Images: []Image{{URI: "a.png"}}}, false},
 		{"Document.Images[0].MimeType", &Document{Asset: Asset{Version: "1.0"},
 			Images: []Image{{BufferView: 1}}}, true},
 		{"Document.Animations[0].Channels", &Document{Asset: Asset{Version: "1.0"},