Resolve symlinks when connecting Indium

Fix GitHub issue #204

* indium-interaction.el (indium-connect, indium-launch): Use `file-truename' to
  resolve the current directory so that the project root is set to a canonical
  directory paph.

indium-interaction.el

@@ -51,7 +51,7 @@
   (interactive)
   (indium-maybe-quit)
   (unless (indium-client-process-live-p)
-    (let ((dir (expand-file-name default-directory)))
+    (let ((dir (indium-interaction--current-directory)))
       (indium-client-start
        (lambda ()
 	 (indium-client-list-configurations
@@ -66,7 +66,7 @@
   (interactive)
   (indium-maybe-quit)
   (unless (indium-client-process-live-p)
-    (let ((dir (expand-file-name default-directory)))
+    (let ((dir (indium-interaction--current-directory)))
       (indium-client-start
        (lambda ()
 	 (indium-client-list-configurations
@@ -422,6 +422,12 @@ hitting a breakpoint."
     (when (indium-breakpoint-at-point)
       (user-error "There is already a breakpoint on the current line")))
 
+(defun indium-interaction--current-directory ()
+  "Return the true name of the current directory.
+
+For the project root to be correctly set, symlinks are resolved."
+  (file-truename default-directory))
+
 (add-hook 'kill-buffer-hook #'indium-interaction-kill-buffer)
 
 (provide 'indium-interaction)