feature/reader-material-tweaks

A few material-related tweaks for the reader:
* Tag/blog info headers now have a primary color background with a reveal animation [example](https://cloudup.com/ciMFO3dDY-h)
* Ripples for like/comment/reblog icons on posts
* Ripples for plus/delete icons on tags in subs activity
* Switched subs activity from ListViews to RecyclerViews

Also fixes #2111 by updating card padding to match material guidelines for keylines.