Issue 81: Fix Bug In LineOfVisibility class

Brianna Aubinrequested to merge
briannaaubin/oresium:issue-fix-bug-in-LineOfVisibility into develop

Fixed bug in LineOfVisibility interval generator, and updated LineOfVisibility unit tests to reflect change. In the process changed the initial date shown from 01/01/0001T00:00:00.000Z to the start date of the Clock object entered into the constructor.

Merge request reports