erchef 1.2.23

Updated deps:

  chef_db
fatal: Invalid revision range 16676c54ab77f3cfaef1378c39b0882e663b71b7..389bb2c55f46f2148cbb976dac8dfbb08a1d0d5f

  chef_wm
    2013-09-03 560d870 Empty header value returns an undefined (treated the same as missing)