This is a nice feature taken from Prelude. This commit advises yank and
yank-pop and evil-paste-after to indent after pasting, unless a prefix
arugment is specified or the major mode is one of
spacemacs-indent-sensitive-modes.
Conflicts:
contrib/better-defaults/README.md
Add open-line command to "SPC j" group: open-line breaks the current
line into two lines without moving the cursor down. It's different from
`o` in Vim.
Use C-o to enter evil-execute-in-normal-state.
