Cycles: Add Saw option to the wave texture

This commit adds "Bands Saw" and "Rings Saw" to the options for the Wave texture node in Cycles, behaving similar to the Saw option in BI textures.
Requested by @cekuhnen on BA.

Reviewers: dingto, sergey

Subscribers: cekuhnen

Differential Revision: https://developer.blender.org/D1699

intern/cycles/render/nodes.h

@@ -267,12 +267,15 @@ public:
 	virtual int get_group() { return NODE_GROUP_LEVEL_2; }
 
 	ustring type;
+	ustring profile;
 	static ShaderEnum type_enum;
+	static ShaderEnum profile_enum;
 
 	virtual bool equals(const ShaderNode *other) {
 		const WaveTextureNode *wave_node = (const WaveTextureNode*)other;
 		return TextureNode::equals(other) &&
-		       type == wave_node->type;
+		       type == wave_node->type &&
+		       profile == wave_node->profile;
 	}
 };