Changed diff faces customization at some point, adding a t.

I am not sure what effect of this is.  But I will go with it for now.
Permanentl registering utf-8-unix as a "safe" buffer-file-coding-system.

This is to ease editting of Rust code.  I would like to better
understand which values for buffer-file-coding-system are *unsafe*, so
that I could ensure that *this* choice of value is not one of those.
Merge branch 'master' of github.com:pnkfelix/DotFiles
Add rust and markdown file support to ack.