nvm: add page

pages/common/nvm.md

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+# nvm
+
+> Node.js version manager.
+> Switch between NodeJS versions: system, node, 0.10, 0.12, 4.2 etc.
+
+- Install a specific version of NodeJS
+
+`nvm install {{node_version}}`
+
+- Use a specific version NodeJS in the current shell
+
+`nvm use {{node_version}}`
+
+- Set the default NodeJS version
+
+`nvm alias default {{node_version}}`
+
+- List all available NodeJS versions and print the default one
+
+`nvm list`
+
+- Run a specific version NodeJS REPL
+
+`nvm run {{node_version}} --version`
+
+- Run app in a specific version of NodeJS
+
+`nvm exec {{node_version}} node {{app.js}}`