improve build script

Signed-off-by: Jakub Sokołowski <jakub@status.im>

build.sh

@@ -1,11 +1,20 @@
 echo "removing old full-build"
-rm -rf full-build
+rm -rf full-build app.zip
+echo "compiling contracts"
+./node_modules/.bin/embark build testnet
 echo "creating new full-build"
 mkdir full-build
 cp -r back-end/* full-build/
+echo "copying special files"
+cp .npmrc full-build/
 echo "building new frontend"
 yarn run build
 echo "copying new frontend"
 rm -rf full-build/frontend/*
 cp -r build/* full-build/frontend/
-echo "Finished. Use your full-build folder"
+echo "archiving the build"
+{
+    cd full-build;
+    zip -r ../app.zip ./
+}
+echo "Finished. Use the app.zip file."