Change to the time period format caused duration to not be set properly.

Adjusted the time period format for Conflict sections (which did not get
updated for the most recent Banner changes). Fixes issue #14.

The new data model design will improve resiliency to these types of
changes.
Merge pull request #15 from CourseScheduler/issue-14

[Issue 14] Change to the time period format caused duration to not be set properly.

This will be included in the next release, 4.12.6, probably before the end of the weekend.