Reformat Slack error messages to use attachments
Strip colon from report_id for several scrapers

For #166
fdic, flra, ncua, tva, usaid
[epa] Remove newlines from report_id (for #166)
[doj] Generate IDs for reports hosted in archives
[usaid] Change report_id for follow-up reports
Merge branch 'master' into unique_report_ids
More illegal characters for report_id validation

Closes #166
[fdic] Distinguish evaluation and audit report #s
[fdic] Add special case to handle bad link
Merge branch 'master' into unique_report_ids