Added setHashQuiet and replaceHashQuiet methods

Your documentation state how to set hash without dispatching hash change event:
https://github.com/millermedeiros/Hasher#setting-hash-value-without-dispatching-changed-signal

I found this really useful, so I added wrappers for `setHash` and `replaceHash` methods, which do this out of the box.

Tests, readme, etc. will write if you decide to use my contribution ;)