Corrected typo in README
Added ignore for agrs to shut ASDF up
Added some necessary symbols to export list

I've forgot to export them, sorry.
Fixed some bugs in hooking mechanism

* Now you are allowed to write just NAME in hook name istead of (PLUGIN
  NAME) and plugin will be assumed as NIL.
* Now DEFHOOKABLE automatically defines DEFUN-function as an alias to
  CALL-HOOKABLE-FUNCTION.
* Now CALL-HOOKABLE-FUNCTION correctly calls attaching points where only
  one hook is defined.