Add operation buttons to Env Variables wizard page.

Screenshot of what the new buttons/actions look like ![Screenshot](https://s3.amazonaws.com/uploads.hipchat.com/8522/779588/vZ5wz2w8l6zwLlh/Add%20Actions%20to%20Environment%20Variables%20Wizard.png)
I'm using the "Add Service" icon to represent adding new Environment variables.
Questions : 
1.Is this overloading the icon too much?
2.Should I be using a different icon?
3.I looked in the icons directory and couldn't find anything suitable.