(build): Upgrade npm on node installation.

Author: hdeshev

build/tns.sh

@@ -2,18 +2,16 @@
 set -e
 
 export NVM_REPO="https://github.com/creationix/nvm.git"
-export NVM_DIR="$(pwd)/.nvm"
+export NVM_DIR="${PROJECT_DIR:-$(pwd)}/.nvm"
 export NODE_VER="v5.5.0"
 
-install_nvm() {
+activate_nvm() {
     if [ ! -d "$NVM_DIR" ] ; then
         git clone --depth=1 $NVM_REPO "$NVM_DIR"
     else
         echo "NVM detected at $NVM_DIR"
     fi
-}
 
-activate_nvm() {
     . "$NVM_DIR/nvm.sh"
 }
 
@@ -22,11 +20,14 @@ installed_under_nvm() {
 }
 
 install_node() {
-    nvm install $NODE_VER
-    nvm use $NODE_VER
+    if ! nvm use $NODE_VER ; then
+        nvm install $NODE_VER
+        nvm use $NODE_VER
+        # upgrade npm to latest version
+        npm install -g npm
+    fi
 }
 
-
 install_latest_tns() {
     if installed_under_nvm tns ; then
         echo "tns already installed."
@@ -36,7 +37,6 @@ install_latest_tns() {
 }
 
 activate_node_env() {
-    install_nvm
     activate_nvm
     install_node
     install_latest_tns