Use brew for osx

.travis.yml

@@ -93,10 +93,13 @@ matrix:
           language: generic
           env: SWBASE=/Users/Shared/buildbot/sw SW=$SWBASE/sw PATH=$SW/bin:$PATH
 
-        # Disabled because harfbuzz is currently broken in brew
-        # - os: osx
-        #   language: generic
-        #   env: USE_BREW=1 BUILD_PKG=osx-bundle
+        - os: osx
+          language: generic
+          addons:
+            homebrew:
+              update: true
+              brewfile: true
+          env: USE_BREW=1 BUILD_PKG=osx-bundle
 
 env:
     global:
@@ -110,12 +113,6 @@ install: |
     if [[ "$RUN_FLAKE" == "1" ]]; then pip install flake8; fi
     if [[ "$TRAVIS_OS_NAME" == 'osx' ]]; then
         if [[ "$USE_BREW" == "1" ]]; then
-            brew update;
-            # brew upgrade python;
-            brew install harfbuzz --without-graphite2 --without-icu4c --without-freetype;
-            brew install imagemagick
-            brew install optipng
-            brew install librsvg
             logo/make.py
         else
             mkdir -p $SW;

Brewfile

@@ -0,0 +1,5 @@
+brew 'imagemagick'
+brew 'optipng'
+brew 'librsvg'
+brew 'harfbuzz'
+brew 'python'