Support for time with subseconds.

* Improve Regexp for times in Repeater to allow subseconds
* Rewrite time parsing in repeater_time to a better way
* Add tests for times with subseconds
* Add example in README for time with microseconds
Use `snake_case` instead of `camelCase`
Add test for argument exception in repeater_time
Merge pull request #195 from davispuh/subsecond

Correctly parse time with subseconds