[sbt] 1 file per plugin

New plugins: revolver, sbt-updates, ctags among others.
[shell] New commands / aliases

- support for cabal commands in PATH (Haskell)
- various tweaks on aliases
[git] minor improvements

- when on GitHub, better compatibility between vimperator and GitHub
  Shortcuts.
- git all-files-by-freshness
[tmux] tmux status line got prettier
[zsh] zprezto out

I have started a fork of zprezto where I keep my config in a branch.
Only zsh general configuration remain in this repo in zshrc.hub.
Everything zprezto related is now in my fork.