Always display leading zeros for milliseconds; use decimal notation
If for whatever reason milliseconds is zero, return 00:00.000
Merge pull request #1 from scudco/fix-zero-display

Always display leading zeros for milliseconds; use decimal notation
add note about minimised windows to readme
removed readme preview
Merge branch 'prevent-negative-one-display' of https://github.com/scudco/Tock into scudco-prevent-negative-one-display

Conflicts:
	tock.js
updated tock.min.js