Fix test runner

gnuplot and gnuplot-context should be loaded when the tests are ran.
There is probably a more elegant solution to require them when running
tests, but at least this works for now.

Author: mtreca

dot.el

@@ -3,3 +3,6 @@
 (setq load-path             (append (list ".") load-path)
       byte-compile-verbose  nil
       byte-compile-warnings nil)
+
+(load "gnuplot")
+(load "gnuplot-context")

gnuplot-context.el

@@ -250,11 +250,11 @@
 
 ;;;; The tokenizer.
 
-(defstruct gnuplot-token
-  start         ; Buffer start position
+(cl-defstruct gnuplot-token
+  start     ; Buffer start position
   end       ; Buffer end position
   id        ; Text
-  type)         ; a symbol: name, number, string, operator, separator
+  type)     ; a symbol: name, number, string, operator, separator
 
 (defvar gnuplot-operator-regexp
   (eval-when-compile