[travis] use homebrew addon instead of calling homebrew ourselves

This should speed up run times.

scripts/travis-setup

-#!/bin/bash
-
-if [[ ! "$TRAVIS" ]]; then
-    echo "This isn't travis..."
-    exit 1
-fi
-
-if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
-
-    echo Updating homebrew
-    brew update
-    echo
-
-    echo Installing library dependencies
-    
-    brew install libjpeg libpng # For pillow.
-
-    # We will use our own ffmpeg, but this is the easiest way for us
-    # to get all of the dependencies. When we were also installing `ffmpeg`
-    # we were getting quite a bit of segfaulting on Travis. We're not sure
-    # what was happening there.
-    brew install ffmpeg --only-dependencies
-
-    echo
-    
-fi

.travis.yml

@@ -23,6 +23,22 @@ addons:
             - wget
             - yasm
             - zlib1g-dev
+    homebrew:
+        packages:
+            - automake
+            - libass
+            - libjpeg
+            - libpng
+            - libtool
+            - libvorbis
+            - libvpx
+            - nasm
+            - opus
+            - shtool
+            - texi2html
+            - theora
+            - wget
+            - x264
 
 cache:
     directories:
@@ -122,7 +138,6 @@ matrix:
 
 
 before_install:
-    - scripts/travis-setup
     - scripts/build-deps
 
 install: