Adds npmE alias

Option to execute a command from node_modules folder

plugins/npm/npm.plugin.zsh

@@ -12,3 +12,6 @@ alias npmS="npm i -S "
 # Install and save to dev-dependencies in your package.json
 # npmd is used by https://github.com/dominictarr/npmd
 alias npmD="npm i -D "
+# Execute command from node_modules folder based on current directory
+# i.e npmE gulp
+alias npmE="'PATH=$(npm bin):$PATH'"