Use eshell more fully

Emacs now starts on eshell by default. Also it uses xterm-colors package for
coloring, instead of default ansi-colors

elisp/eshell-setup.el

@@ -0,0 +1,9 @@
+;; colors in eshell
+(add-hook 'eshell-mode-hook
+          (lambda ()
+            (setenv "TERM" "xterm-256color")))
+(add-hook 'eshell-before-prompt-hook (lambda ()
+				       (setq xterm-color-preserve-properties t)))
+(add-to-list 'eshell-preoutput-filter-functions 'xterm-color-filter)
+(setq eshell-output-filter-functions
+      (remove 'eshell-handle-ansi-color eshell-output-filter-functions))