lispy.el (lispy-parens): allow space after lambda
lispy.el (lispy-to-defun): add and bind to "xd"

* lispy.el (lispy-mode-x-map): New map.
  (lispy-x): Add and bind to "C-4" globally and "x" locally, forwards to
  `lispy-mode-x-map'.
  (lispy-to-lambda): unbind from "L", bind to "xl".