Add more vector.negate() methods and bump-up the version

pom.xml

@@ -3,7 +3,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>org.lwjgl</groupId>
 	<artifactId>joml</artifactId>
-	<version>1.0.2-SNAPSHOT</version>
+	<version>1.0.3-SNAPSHOT</version>
 	<name>JOML</name>
 	<description>Java-OpenGL-Math-Library</description>
 	<inceptionYear>2015</inceptionYear>

src/com/joml/Vector2d.java

@@ -220,4 +220,15 @@ public void readExternal(ObjectInput in) throws IOException,
         y = in.readDouble();
     }
 
+    /**
+     * Negate this vector.
+     * 
+     * @return this
+     */
+    public Vector2d negate() {
+        x = -x;
+        y = -y;
+        return this;
+    }
+
 }

src/com/joml/Vector2f.java

@@ -159,4 +159,15 @@ public void readExternal(ObjectInput in) throws IOException,
         y = in.readFloat();
     }
 
+    /**
+     * Negate this vector.
+     * 
+     * @return this
+     */
+    public Vector2f negate() {
+        x = -x;
+        y = -y;
+        return this;
+    }
+
 }

src/com/joml/Vector3d.java

@@ -446,4 +446,16 @@ public void readExternal(ObjectInput in) throws IOException,
         z = in.readDouble();
     }
 
+    /**
+     * Negate this vector.
+     * 
+     * @return this
+     */
+    public Vector3d negate() {
+        x = -x;
+        y = -y;
+        z = -z;
+        return this;
+    }
+
 }

src/com/joml/Vector3f.java

@@ -406,6 +406,11 @@ public void readExternal(ObjectInput in) throws IOException,
         z = in.readFloat();
     }
 
+    /**
+     * Negate this vector.
+     * 
+     * @return this
+     */
     public Vector3f negate() {
         x = -x;
         y = -y;