[CLI] `lb4` does not create app with uppercase letters

Description / Steps to reproduce / Feature proposal

$ lb4 myLB4app
> Generation is aborted: Invalid npm package name: myLB4app

This is likely due to the package.json's name format restriction. We should use the user-submitted name for everything (directory name etc.), except for the name property in package.json; for that, CLI should do the hyphenation and lowercasing for the user.

Thoughts?

Current Behavior

lb4 refuses to create an app if it contains uppercase letters.

Expected Behavior

Should allow creation of apps with uppercase and lowercase letters.

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