Merge pull request #742 from sjasperse/bugfix/rasp-pi-2-arch-detect

adding architecture detection for Raspberry Pi 2

nvm.sh

@@ -973,7 +973,7 @@ nvm_install_node_binary() {
     if nvm_binary_available "$VERSION"; then
       local NVM_ARCH
       NVM_ARCH="$(nvm_get_arch)"
-      if [ $NVM_ARCH = "armv6l" ]; then
+      if [ $NVM_ARCH = "armv6l" ] || [ $NVM_ARCH = "armv7l" ]; then
          NVM_ARCH="arm-pi"
       fi
       t="$VERSION-$NVM_OS-$NVM_ARCH"