fix(travis): add install script

scripts/install.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+OK="OK"
+ERROR="ERROR"
+yarnRegistry="registry.yarnpkg.com"
+npmRegistry="registry.npmjs.org"
+
+npmPingStatus=`ping -c 1 $npmRegistry > /dev/null && echo $OK || echo $ERROR`
+yarnPingStatus=`ping -c 1 $yarnRegistry > /dev/null && echo $OK || echo $ERROR`
+
+yarnHttpStatus=`curl "https://"$yarnRegistry -k -s -f -o /dev/null && echo $OK || echo $ERROR`
+npmHttpStatus=`curl "https://"$npmRegistry -k -s -f -o /dev/null && echo $OK || echo $ERROR`
+
+echo "yarn ping status: $yarnPingStatus"
+echo "yarn http status: $yarnHttpStatus"
+
+echo "npm ping status: $npmPingStatus"
+echo "npm http status: $npmHttpStatus"
+
+if [ $yarnHttpStatus = $OK ] ; then
+   yarn install --cwd ../
+
+else if [ $npmHttpStatus = $OK ] ; then
+   npm install
+
+else
+   echo "Network failure"
+
+fi
+fi