add Sazare.Common project.
add some classes to Sazare.Common and move IExecutable to Sazare.Common
update interface reference from IExecutable to Sazare.Common.IExecutable
add CuiOutputManager
call Output.SetOutputManager() on entry-point
replace from Console.Write to Output.Write overall samples.
fix #47

* feature/#47/create-output-manager:
  replace from Console.Write to Output.Write overall samples.
  call Output.SetOutputManager() on entry-point
  add CuiOutputManager
  update interface reference from IExecutable to Sazare.Common.IExecutable
  add some classes to Sazare.Common and move IExecutable to Sazare.Common
  add Sazare.Common project.