Provide the ability to specify library dependencies for user

It'd be awesome to have a possibility to specify a set of publicly available libraries (maybe from limited set of allowed libraries), such as scalaz or spire as library dependencies in user profile and to be able to import them into snippet.

[shmed]

This is definitely something we were considering. It's still something we would like to add in the future. +1

I have found that shapeless is already included and 'import shapeless._' can be used :)

[sebnozzi]

Please also consider support for using a testing framework (e.g. ScalaTest and its variants)