lispy.el (lispy-mode-map): bind "xs" to `save-buffer'
lispy.el (lispy-barf): re-indent less

Speeds up by a lot. Re-indentation appears to remain the same quality.
lispy.el (lispy--normalize): save-restriction
lispy.el (lispy-ace-char): save-restriction
lispy.el (lispy--barf-backward): use `lispy--indent-region'

* lispy.el (lispy--indent-region): New function.