Remove reference of deploydapp.com
fix #14 your-first-api.md not found
Added "from:" field to dpd-email example usage

Depending on configuration of the dpd-email defaultFromAddress, the example usage would result in the following error:

`[Error: Can't set headers after they are sent.]`

By adding a 'from:' field to the example, this error can be avoided for that configuration condition.