support for EC2 IAM roles with Amazon S3 file store/backup
refactor multiple instances of S3 key check logic to single variable
Pass rejection message along in rejection mail if present
Start making better-written tests for the email job
Refactor out handle_failure method in PollMailbox
Attempt at checking throws....
Add more tests, undo some changes to fixture files

Was causing Email::Reciever tests to fail
Revert bad diff
Merge pull request #2614 from riking/email-tests

Email tests, and include posting error reason
TESTS: Remove `URL_FIXTURES` constant for pretender
TYPO: Missing comma
FIX: don't validate topic title if it isn't changing. topic stats were failing to update, causing necro topic warnings and other problems.
FIX: automatic redirection to /top was a bit janky
adjust img width to auto ONLY ON REPLY EXPANSIONS
guard against permission denied errors
reading from /proc/<pid>/smaps is not available inside of Docker container
TRIVIAL: forgot to remove the href
phpbb category names can be longer than 50 chars and are rejected during import
PERF: reduce storage requirements for incoming links

Only store incoming links for topics.
Annotate changes
PERF: refactor incoming links table