Just a small typo in 1.7.0 changelog

In the documentation, surround the new operators with `<tt>` tags instead of Markdown-style backticks, since this is HTML.

Fix markup in math operator documentation

The commas separating these three keywords are not code themselves – not what the user would write – so they should be outside of the `<tt>` tags.

Edits the table in the section [Operators and Aliases](http://coffeescript.org/#operators).

I had missed that the next line had comma-separated operators, too.

In docs, move commas out of code

`options.fileName` was used instead of `options.filename`.

Fix a typo causing module.paths to be always set as the cwd.