Small improvements

Hi Matthew

I made this improvements because that way it seems to make more sense to me.

- Unparsable strings return the current date instead of tomorrow.
- Better prediction if parsed date is close to now (same minute). If it's 10:24 and the string to parse is "10:24", the result will be the current date, not tomorrow.

Great work by the way!

PS: My changes are only on one line, the rest is the result of running `make dist && make dist-minify` against current master. Tests pass. I'll dive into the i18n subject soon.