Support multiple runs per build

[EricRahm]

It would be useful to be able to do a few runs on a try run to get a fuller result set. Perhaps -awsy <series>,<retries>

Internally we'd need to make sure the results are stored for each run (instead of overwriting). Perhaps this would be as simple as appending a sequence number to the build name, ie: 9fc94963d424-1

On the web side we'd want to order builds sequentially, ie:
<build_a_1>, <build_a_2>, <build_b_1>, <build_b_2>