deb.haskell.org is dead, updated to 7.8.4

Makefile

@@ -12,3 +12,6 @@ FLAGS = --normalize --smart --toc $(VARIABLES)
 
 pdf: README.md
 	$(PANDOC) -s $(INPUT) -o $(OUTPUT) $(FLAGS) --column=80
+
+dialogues: dialogues.md
+	$(PANDOC) -s dialogues.md -o dialogues.pdf $(FLAGS) --column=80

README.md

@@ -88,13 +88,13 @@ $ sudo apt-get install python-software-properties # v12.04 and below
 $ sudo apt-get install software-properties-common # v12.10 and above
 $ sudo add-apt-repository -y ppa:hvr/ghc
 $ sudo apt-get update
-$ sudo apt-get install cabal-install-1.20 ghc-7.8.3 happy-1.19.4 alex-3.1.3
+$ sudo apt-get install cabal-install-1.20 ghc-7.8.4 happy-1.19.4 alex-3.1.3
 ```
 
 Then add the following to your `$PATH` (bash\_profile, zshrc, bashrc, etc):
 
 ```
-~/.cabal/bin:/opt/cabal/1.20/bin:/opt/ghc/7.8.3/bin:/opt/happy/1.19.4/bin:/opt/alex/3.1.3/bin
+~/.cabal/bin:/opt/cabal/1.20/bin:/opt/ghc/7.8.4/bin:/opt/happy/1.19.4/bin:/opt/alex/3.1.3/bin
 ```
 
 *Optional:* You could also add `.cabal-sandbox/bin` to your path. Code that you
@@ -103,20 +103,6 @@ only works when your current working directory is a cabal sandbox.
 
 ## Debian
 
-### GHC Repository for debian stable
-
-If you use Debian stable, it is easier to use http://deb.haskell.org/. To
-use it:
-
-- Add the line `deb http://deb.haskell.org/stable/ ./` to `/etc/apt/sources.list`
-
-```bash
-## Add the key to avoid warnings
-$ GET http://deb.haskell.org/deb.haskell.org.gpg-key | apt-key add -
-$ sudo apt-get update
-$ sudo apt-get install ghc-7.8.3 happy alex cabal-install
-```
-
 ### Using Ubuntu PPA
 
 If you're not using stable, you can follow the same steps as Ubuntu, but will