Emacs configuration based on el-get.el

Usability packages:

• emacs-nav
• popup-switcher
• goto-last-change
• ace-jump-mode
• expand-region
• mark-multiple
• old-fashioned-undo
• paredit
• smex
• ido (with flx)
• auto-complete
• elisp-slime-nav
• projectile

Programming modes:

• ensime
• scala-mode2
• haskell-mode
• js2-mode
• web-mode
• emmet-mode
• markdown-mode

Modeline: powerline

Theme: modified tango-dark