Log all arguments, not just the first, in unit tests's log()
Add .js extension in require call with relative path, for consistency

Although the extension is optional, it is more explicit to include it
when referring to a module by its path.
Test scope-leve8-log both in Node.js and in the browser
Clarify that in Node.js 'exports' refers to the file's module

The property is not resolved dynamically to the exports of a module
being required.
Add unit tests for scope-level3-commonjs in Node.js
Add examples and unit tests for Node.js