Bring workflow timing diagram up to date

[davidangb]

FireCloud implements its own JavaScript for workflow timing diagrams - heavily copy/pasted from Cromwell, with some important changes due to different ajax/data patterns.

Cromwell's JavaScript has updated since FireCloud last copied it, with important new features such as:

• support for subworkflows
• support for different queue states

Please update FireCloud's JavaScript to be in sync with Cromwell's.