show time stamp when inserting documents using watch

[eurochriskelly]

When modifying the same source file over and over the screen begins to look like this:

-> Insert document:       /foo/bar.sjs
-> Insert document:       /foo/bar.sjs
-> Insert document:       /foo/bar.sjs
-> Insert document:       /foo/bar.sjs
-> Insert document:       /foo/bar.sjs
-> Insert document:       /foo/bar.sjs
-> Insert document:       /foo/bar.sjs

At some point, it's no longer clear if the documents are being inserted in MarkLogic because the terminal window does not appear to change - even though it probably did. This becomes an issue when a separate process is generating the files that are being watched by mlproj (e.g. using webpack to generate frontend). A timestamp would clear that up.