Update submodule neobundle 6906d95...18fe84c

* neobundle 6906d95...18fe84c (14):
  > Fix neobundle error
  > Fix autoload keys
  > Improve Examples
  > Improve autoload commands behavior
  > Add command_prefix feature
  > Update examples
  > Add "<Plug>" mapping for autoload
  > Improve unite_sources default behavior
  > Fix #302 unite_sources problem
  > Fix reinstall problem
  > Improve :NeoBundleCheck behavior
  > Fix #300 mkdir() problem
  > Remove backticks
  > Improve documentation
Update eclim