I got the same error with the first method.
When I tried the second one, I got the following error -
$ ./grunt build
module.js:340
throw err;
^
Error: Cannot find module
'C:\Users\atreya\Downloads\zeppelin-0.5.6-incubating\zeppelin-web\node_modules\.bin\grunt'
at Function.Module._resolveFilename (module.js:338:15)
at Function.Module._load (module.js:280:25)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:901:3
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