Changes to NCIP::ILS::Evergreen as a result of testing.

Changes to NCIP::ILS::Evergreen as a result of testing.

These modifications are based on testing with Auto-Graphics and
reflect how they say they will be sending data in production. They
will return the ItemId that we are now returning in the response
to RequestItem so we can use that to find the appropriate hold to
cancel.

The above necessitated some internal changes to the code that
amounted to a simplification of placing holds (in some cases) as
well as a simplification in canceling holds. There is still some
cruft hanging around that should probably go away, but I think
we're safe for now.

We've also update some templates to fix issues while testing the
above mentioned changes, specifically RequestItemResponse.inc and
CancelRequestItemResponse.inc.

Signed-off-by: Jason Stephenson <jason@sigio.com>