message: Adds free_command_buffers to device
diff: use prelude::*;
  use std::mem;
  use vk;
  -use ::RawPtr;
  +use RawPtr;
  use version::{FunctionPointers, V1_0};
  #[allow(non_camel_case_types)]
  @@ -25,6 +25,15 @@ pub trait DeviceV1_0 {
  self.fp_v1_0().free_memory(self.handle(), memory, allocation_callbacks.as_raw_ptr());
  }
  + unsafe fn free_command_buffers(&self,
  + command_pool: vk::CommandPool,
  + command_buffers: &[vk::CommandBuffer]) {
  + self.fp_v1_0().free_command_buffers(self.handle(),
  + command_pool,
  + command_buffers.len() as vk::uint32_t,
  + command_buffers.as_ptr());
  + }
  +
  unsafe fn destroy_fence(&self,
  fence: vk::Fence,
  allocation_callbacks: Option<&vk::AllocationCallbacks>) {
  