Merge branch '78-trust-indicators' into '402-blog-client-implementation'

New Trust Level Indicator Replaces The Stars

This implements a generic `TrustIndicatorView` with a `setTrustLevel()`
method which updates the drawable according to the `Author.State`.

It also removes unused files from the repo.

This is based on !212 and should only be merged after it.

Closes #78

See merge request !217