fix bug introduced in retry implementation.

Merge pull request #8 from Azure/haitao/fix_err_case

Haitao/fix_err_case

add retry interface

allow steps to be retriable.

rich template

with color, shape, tooltip

drop terraform/dag ref

due to too many imports

depend on fix

Merge pull request #3 from Azure/haitao/dependon-fix

dependon fix

v0.1.0

Merge pull request #1 from Azure/haitao/paramstep-start

fix a bug where step can start before job start