Timeline view of timezone recurrence rules

[allenporter]

Is your feature request related to a problem? Please describe.
Need some kind of helper to interpret Timezone rules (e.g. determine the offset of a specific local time)

Describe the solution you'd like
The timezone component will have an rrule and rdate to give a view of all the occurrences, however it also needs to give a way to scan across them all -- e.g. a timeline view of an object with a utc offset.

[allenporter]

It likely makes sense to implement a datetime.tzinfo in terms of VTIMEZONE data.

[allenporter]

This is now implemented in timezone.py