Style the logged in / logged out indicator

[dstufft]

We'll want to fix things so that there is a logged in indicator when the user is logged in that can list all of their projects and take them to the management pages for their projects.

[dstufft]

With #837 this now only needs for the design to incorporate a logged in indicator. That bit of the design is controlled by the warehouse/templates/includes/current-user-indicator.html template.

[di]

Now that #1437 is merged, should we take this out of the "Launch" milestone?

[dstufft]

This should be good enough for launch yes.

[nlhkabu]

Adding this back to launched milestone as we need to address this (along with the extra links) on mobile :)