Cluster topology submission bug fixes and swappable class loader policy support.

[juliencruz]

• Added swappable class loader policy selection to topology submission form
• Added configurable selection of log level to topology submission form
• Added momentjs date support to UI elements
• Added historic log search in cluster log search
• Added topology kill dialog with wait time in seconds similar to native Storm UI
• Added more streamflow namespaced properties for injection in spouts and bolts
• Fixed numerous bugs

[christopherlakey]

Looks good to me.