Implemented npm version check (#314)

scripts/npm.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+SUPPORTEDNPMVERSION="4.2.0"
 
 if [[ "$OSTYPE" == "darwin"* ]]; then
 	realpath() { [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"; }
@@ -8,7 +9,7 @@ else
 	ROOT=$(dirname "$(dirname "$(readlink -f $0)")")
 
 	# if [ -z $npm_config_arch ]; then
-	# 	npm_config_arch=$(node -p process.arch)
+	# 	npm_config_arch=$(npm -p process.arch)
 	# 	echo "Warning: remember to set \$npm_config_arch to either x64 or ia32 to build the binaries for the right architecture. Picking '$npm_config_arch'."
 	# fi
 fi
@@ -26,4 +27,10 @@ npm_config_disturl=https://atom.io/download/electron \
 npm_config_target=$ELECTRON_VERSION \
 npm_config_runtime=electron \
 HOME=$ELECTRON_GYP_HOME \
-npm $*
+npm $*
+
+CURRENTNPMVERSION=`npm --version`
+if [[ "$CURRENTNPMVERSION" != "$SUPPORTEDNPMVERSION" ]]; then
+	YELLOW='\033[1;33m'
+	echo -e "${YELLOW}NPM version ${CURRENTNPMVERSION} is not supported with this project. We strongly recommend to use version ${SUPPORTEDNPMVERSION}"
+fi