melpa-packages: 2018-04-01

Removals:
 - anything*, helm-anything: removed from melpa
 - auth-password-store: renamed to auth-source-pass
 - cake*, ac-cake*: removed from melpa
 - imgur: removed from melpa
 - magit-rockstar: removed from melpa
 - mmm-mode: removed from melpa
 - org-fstree: removed from melpa
 - undo-tree: removed from melpa