Fixes #46 Weird behavior of projectile

Projectile takes time to load (around 0.2 seconds) and it is
lazy loading friendly if we want to enable it globally.

To be able to lazy load it, we encapsulate the binded calls
in spacemacs/xxx functions which take care of firing the
mode globally if required.

spacemacs/packages.el

@@ -1560,24 +1560,34 @@ DELETE-FUNC when calling CALLBACK.
 
 (defun spacemacs/init-projectile ()
   (use-package projectile
-    :commands (projectile-switch-to-buffer
-               projectile-invalidate-cache
-               projectile-dired
-               projectile-find-file
-               projectile-kill-buffers
-               projectile-grep
-               projectile-replace)
+    :commands projectile-global-mode
     :init
-    (evil-leader/set-key
-      "pC" 'projectile-invalidate-cache
-      "pd" 'projectile-dired
-      "pF" 'projectile-find-file
-      "pg" 'projectile-grep
-      "pk" 'projectile-kill-buffers
-      "pr" 'projectile-replace
-      "ps" 'projectile-switch-to-buffer)
+    (progn
+      (defun spacemacs/projectile-lazy-loading (func)
+        "Wrap FUNC in order to be able to lazy load projectile."
+        (let ((funcstr (symbol-name func)))
+          (eval `(defun ,(intern (format "spacemacs/%s" funcstr)) (arg)
+                   ,(format "Call %s" funcstr)
+                   (interactive "P")
+                   (projectile-global-mode)
+                   (call-interactively ',func arg)))))
+      (mapc 'spacemacs/projectile-lazy-loading '(projectile-invalidate-cache
+                                                 projectile-dired
+                                                 projectile-find-file
+                                                 projectile-grep
+                                                 projectile-kill-buffers
+                                                 projectile-replace
+                                                 projectile-switch-to-buffer))
+      (evil-leader/set-key
+        "pC" 'spacemacs/projectile-invalidate-cache
+        "pd" 'spacemacs/projectile-dired
+        "pF" 'spacemacs/projectile-find-file
+        "pg" 'spacemacs/projectile-grep
+        "pk" 'spacemacs/projectile-kill-buffers
+        "pr" 'spacemacs/projectile-replace
+        "ps" 'spacemacs/projectile-switch-to-buffer))
     :config
-    (spacemacs//diminish projectile-mode " Ⓟ")))
+    (spacemacs//hide-lighter projectile-mode)))
 
 (defun spacemacs/init-python ()
   (use-package python