(v1.4) Refactor

+ Use defcustom instead of defvar where appropriate
+ evil-snipe-search-* renamed to evil-snipe-enable-*
+ evil-snipe-repeat-(sS|nN) vars replaced with defuns
  (evil-snipe-enable-sS) and (evil-snipe-enable-nN)
+ evil-snipe-override-evil var replaced with defun
  (evil-snipe-replace-evil)
+ Rewrote README for brevity + clarity
+ Refactored interactive codes for brevity