Add installer messages

installer/intro.txt

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+MM""""""""`M
+MM  mmmmmmmM
+M`      MMMM 88d8b.d8b. .d8888b. .d8888b. .d8888b.
+MM  MMMMMMMM 88''88'`88 88'  `88 88'  `"" Y8ooooo.
+MM  MMMMMMMM 88  88  88 88.  .88 88.  ...       88
+MM        .M dP  dP  dP `88888P8 '88888P' '88888P'
+MMMMMMMMMMMM
+
+    M""MMMMMMMM M""M M""MMMMM""M MM""""""""`M
+    M  MMMMMMMM M  M M  MMMMM  M MM  mmmmmmmM
+    M  MMMMMMMM M  M M  MMMMP  M M`      MMMM
+    M  MMMMMMMM M  M M  MMMM' .M MM  MMMMMMMM
+    M  MMMMMMMM M  M M  MMP' .MM MM  MMMMMMMM
+    M         M M  M M     .dMMM MM        .M
+    MMMMMMMMMMM MMMM MMMMMMMMMMM MMMMMMMMMMMM
+
+      http://github.com/overtone/emacs-live
+
+
+This installer will download the Emacs Live config
+and place it in ~/.emacs.d for you.
+
+It will also move any old emacs config files into
+~/emacs-live-old-config so you may revert back if
+necessary.

installer/outro.txt

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+             M"""""`'"""`YM
+             M  mm.  mm.  M
+             M  MMM  MMM  M        dP.  .dP
+             M  MMM  MMM  M 888888  `8bd8'
+             M  MMM  MMM  M         .d88b.
+             M  MMM  MMM  M        dP'  `dP
+             MMMMMMMMMMMMMM
+
+Energy starts surging through your fingertips. Sparks fly, making
+the shadows grow and flicker ominously around you. You arch your
+back and open your eyes as if for the first time. The text appears
+more vibrant and colourful than you remember. Your fingers dance on
+the keyboard commanding the cursor with a joyful precision and
+control.
+
+You lean back and marvel as a shimmering swirl of syntactic and
+symantic structures project out of the screen and intertwine with a
+fractal beauty. You watch as meaning recursively unfolds into deeper
+meaning live in front of your eyes. You feel a deep and lasting
+synchronicity form as the boundaries between you and your Emacs
+wash away. You and your Emacs Live.
+
+M-x start-hacking.