Added isOnMaterial(material: Material) extension

src/main/kotlin/net/axay/kspigot/extensions/bukkit/EntityExtensions.kt

@@ -29,6 +29,12 @@ val Entity.isFeetInWater: Boolean get() = this.location.block.type == Material.W
  */
 val Entity.isGroundSolid: Boolean get() = this.location.add(0.0, -0.01, 0.0).block.type.isSolid
 
+/**
+ * Checks if the entity stands on a specific material.
+ * @param material the material you are looking for
+ */
+fun Entity.isOnMaterial(material: Material): Boolean = location.block.type == material
+
 /**
  * Kills the damageable.
  */