Upgraded VCR to 2.4

from 1.11 - this required a change to the earlier
vcr cassettes since the format changed.

some minor initial configuration changed as well
Removed unused methods #3248

Upgrade of VCR showed a few methods
that were no longer used anywhere other
than in tests.
schedule includes all open activities #3248
renamed method #3248

schedule_pending_event was only used
when re-scheduling an activity, so renamed
the method accordingly
added open?/closed? #3248

to ScheduledActivity

open = scheduled or conditional
closed = missed or N/A or occurred or canceled
Reschedule open activities #3248

Closes #3248
Update YARD documentation
Added set for open states

for a scheduled activity
Merge pull request #27 from NUBIC/bug_3248

Bug 3248