Display the current_user's tools in the dashboard sidebar.

:fork_and_knife: 

This deviates from [the design](https://projects.invisionapp.com/share/YR11UBDT2#/screens) of tools in the dashboard, but I think it does a more effective job at simply displaying the current user's tools in the Dashboard.

What does everyone else think?

Note: the simple tool partial lists to the user's tools list because the tool show does not exist at this time. We will want to change that.