Remove now-unnecessary ergoemacs-kill-line-backward hack
Add org-mode customizations
Tweak diminish settings a bit
Add clojure customizations

* Use kibit mode by default
* Remove some conflicting clojure-test-mode keybindings
Don't auto-complete automatically
Add missing dropbox directory variable
Add explicit keybinding for ido-switch-buffer

Ergoemacs mode was shadowing it.
Add keybindings for killing sexps
Replace ergoemacs-cut-line-or-region with clipboard-kill-region