Cleanup and evil setup

Removed several functions from init-functions that I didn't
actually use.

Lots of other cleanup.

The variable "is-vim-user" in init.el controls whether or not
evil packages should be installed and configured.
Evil configuration file
Disabled evil tabs mode (because it's gone??)
Reenabled marmelade
Added project-explorer
nrepl.el is cider now
Fix settings for nrepl.el -> cider