Added org-mode package repo fixed coloring with Ag

+ Updated org package source to get up-to-date releases (read here)[http://irreal.org/blog/?p=6899]

+ Had an issue very similar to what was
described (here)[Wilfred/ag.el#124], tracked this down
to the fact that Ag major mode inherits from compilation mode. My hook for
colorizing the ANSI colors was breaking Ag coloring. Hook now only runs if major
mode is compilation-mode. Seems to work for all packages in my normal workflow
right now. Note that many people recommend using `compilation-filter-start'
variable instead of `(point-min)' and `(point-max)' (see (for example
here)[https://stackoverflow.com/questions/13397737/ansi-coloring-in-compilation-mode],
but that wasn't working for me. Didn't bother to track down

dotemacs.el

@@ -13,6 +13,8 @@
 (add-to-list 'package-archives
 	     '("melpa-stable" .
 	       "http://stable.melpa.org/packages/") 'APPEND)
+;; add org-mode packages:
+(add-to-list 'package-archives '("org" . "https://orgmode.org/elpa/") t)
 (package-initialize)
 
 ;; tools for benchmarking startup:
@@ -570,11 +572,12 @@
 (global-set-key "\C-x\C-r" ros-keymap)
 ;; since ROS Groovy, catkin inserts ansi-color sequences into the output of the
 ;; compilation buffer... let's fix that
-(defun colorize-compilation-buffer ()
-  (toggle-read-only)
-  (ansi-color-apply-on-region (point-min) (point-max))
-  (toggle-read-only))
-(add-hook 'compilation-filter-hook 'colorize-compilation-buffer)
+(ignore-errors
+  (require 'ansi-color)
+  (defun colorize-compilation-buffer ()
+    (when (eq major-mode 'compilation-mode)
+      (ansi-color-apply-on-region (point-min) (point-max))))
+  (add-hook 'compilation-filter-hook 'colorize-compilation-buffer))
 ;; the way I am doing the following doesn't seem very safe!
 (defvar compile-history nil)
 (setq compile-history '("cd /home/jarvis/indigows/ && catkin_make "))