Deploy maven artifacts to Conveyal's Maven repo S3 bucket.

Requires ~/.m2/settings.xml with IAM credentials for maven user.
Also: use 1.0-SNAPSHOT for version on master for consistency
revice bidirectional heuristic: ignore transit vertices other than stops

fixes failing tests for on-board depart
Switch to an S3 wagon that can handle subdirectories.

Check that the site builds properly before releasing.