The exception time display as default timezone.

Remove function date-str.
Change the exception time returned as a raw value.
Add moment.js used format timezone.
Merge branch 'master' into STORM-364
Updated the REST API documentation,add the component-errors property description.
Merge branch 'STORM-364' of https://github.com/shell0dh/incubator-storm into STORM-364

STORM-364: The exception time display as default timezone.
Updated License, Changelog, and README for STORM-364.