EUnit regression test case for `Cd8` of PR 156

See the `Cd8` PULSE counterexample in https://github.com/basho/bitcask/pull/156
Bugfix: calculate end of table while still holding lock
Preserve biggest_file_id across close & re-open
Change 'the_biggest += 100' to 'the_biggest++'
Merge pull request #170 from basho/bug/deferred-delete-Cd8

Deferred delete bug (aka Cd8)

Reviewed-by: engelsanchez