Strict mode for exact file name matches

[PRR24]

As world is moving slowly but surely away from auto-extensions, please consider implementing a strict name matching option, that disables all heuristics and matches file references precisely.
For example, in strict mode require("file") would not match with file.js.
Such mode would also dramatically reduce false-positives, like matching let smth = "file";
Thank you.

[Maxim-Mazurok]

See #97 and https://github.com/smysnk/gulp-rev-all#annotater--replacer