Update README.md
reorder imports
replace fmt.Spritnf("%s", e) with e.Error()
Merge pull request #74 from mailgun/jeremy/fmt

reorder imports
Merge pull request #73 from mailgun/jeremy/error

Replace fmt.Sprintf("%s", e) with e.Error()
Support TLS, dynamic listeners and encrypted storage
Fix cli args
Address code review comments
Vendor dependencies