Update mail_sandbox.
Added separate web & smtp servers process.
Kill servers if pid file exists.
QUIT insted -9 signal.
True stop tasks.
Fixed cap sandbox:restart task.
Updated README.
Merge branch 'feature/separate' into develop

* feature/separate:
  Updated README.
  Fixed cap sandbox:restart task.
  True stop tasks.
  QUIT insted -9 signal.
  Kill servers if pid file exists.
  Added separate web & smtp servers process.
Merge branch 'release/v14'

* release/v14:
  Updated README.
  Fixed cap sandbox:restart task.
  True stop tasks.
  QUIT insted -9 signal.
  Kill servers if pid file exists.
  Added separate web & smtp servers process.
  Update mail_sandbox.