Fix the Travis-CI script by installing git lfs

Author: dreampiggy

.travis.yml

@@ -15,6 +15,7 @@ notifications:
 before_install:
   - env
   - locale
+  - brew install git-lfs
   - gem install cocoapods --no-document --quiet
   - gem install xcpretty --no-document --quiet
   - pod --version
@@ -23,6 +24,9 @@ before_install:
   - xcodebuild -version
   - xcodebuild -showsdks
 
+before_script:
+  - git lfs pull
+
 script:
   - set -o pipefail