Added support for a timeSeparator option

Looks like is working, can change ':' with dot '.'. For me is useful to integrate with java locales
At line 766 don't know syntax to include separator dynamically in RegEx however there are only two separators in all java locales: ':' and '.'. Next step could be similar work for AM/PM symbol (eg: Arabic م Greek μμ) and (harder perhaps) AM/PM before or after time, in Chinese for example is before 下午9:21