Reassigning keybindings for evil-leader

Leaving `o` free for spacemacs/layer
Add conventions to CONVENTIONS.md
Moved trishume contrib and better Racket support
Extracted a separate layer for Auctex
Merge branch 'trishume/fix-up-contrib' into develop
Update spacemacs.template file location.
Add smex configuration layer
Better definition of custom ido key binidngs
Add 200th star achievement
Missing smex png
Add github configuration layer
Move Haskell to its own lang contrib layer
fix template location in DOCUMENTATION.md
Fixes #186 Extend support for native themes.
Add leuven theme from MELPA
Disable auto-highlight-symbol in org-mode