use ggrep on mac instead of bsd grep

.travis/after_success.sh

@@ -11,7 +11,7 @@ wget -c https://github.com/probonopd/uploadtool/raw/master/upload.sh
 
 # Check if there's been a new commit since this build, and if so don't upload it
 
-REMOTE=$(curl -s -N https://api.github.com/repos/olive-editor/olive/commits/master | grep -Po '(?<=: \")(([a-z0-9])\w+)(?=\")' -m 1)
+REMOTE=$(curl -s -N https://api.github.com/repos/olive-editor/olive/commits/master | $GREP -Po '(?<=: \")(([a-z0-9])\w+)(?=\")' -m 1)
 LOCAL=$(git rev-parse HEAD)
 
 if [ "$REMOTE" == "$LOCAL" ]

.travis/install.sh

@@ -2,11 +2,14 @@
 
 if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
 
-	brew install ffmpeg qt5 python@2
+	brew install ffmpeg qt5 python@2 grep
+	export GREP=ggrep
 	export PATH="/usr/local/opt/qt/bin:/usr/local/opt/python@2/libexec/bin:$PATH"
 
 elif [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
 
+	export GREP=grep
+
 	if [ "$ARCH" == "x86_64" ]; then
 		sudo apt-get -y install qt59base qt59multimedia qt59svg libavformat-dev libavcodec-dev libavfilter-dev libavutil-dev libswscale-dev libswresample-dev frei0r-plugins-dev frei0r-plugins fuse
 	fi