Merge pull request #13 from ruebot/7.x-ISLANDORA-977

Address ISLANDORA-977
Following up on #4 -- we need to make sure the cron runs as user 1 here as well, so that we don't get a 401 unauthorized.
Merge pull request #15 from ruebot/7.x-cron

Following up on #4 -- we need to make sure the cron runs as user 1 here ...
Fixed resetting of islandora_checksum_checker_mismatches system variable; fixed formatting of DSID value in failure report email.
Merge branch '7.x-1.4' of github.com:mjordan/islandora_checksum_checker into 7.x-1.4