implement local event handling

[imcaizheng]

Notes

• The event handling is implemented in an asynchronous way so that it conforms to the original requirement mentioned on [$150] Automatic status updates #54, and, the logic is still decoupled in the meantime.
• The logic at src/app-routes.js and inside function ResourceBookingService.updateResourceBooking are slightly altered
  to work with the event handling. Please review these changes particularly to ensure nothing would be broken due to that.

[maxceem]

@imcaizheng, automatic updates doesn't work for me. When I make any action which supposes to trigger automatic updates, I get error.

1. When I update ResourceBooking status to assigned I get an error:

   

   • To reproduce I create Job, JobCandidate and ResourceBooking using the same userId, to trigger automatic status update logic.

2. If I change the status of Job to cancelled I get an error:

   

[imcaizheng]

@maxceem I tried to resolve the conflict between the PR and dev branch but I did it wrongly. Please discard the last commit and merge the last but one, named revert the change made to app-routes.js.

[maxceem]

@imcaizheng hmm, I don't think there is a way to discard the last commit during merging. Could you please, revert the wrong commit from imcaizheng:implement-event-handlers branch, so it's not included in the PR?

[imcaizheng]

@maxceem Thanks. The change is reverted.

[maxceem]

@maxceem Thanks. The change is reverted.

@imcaizheng Looks like during merging changes that were done for permissions in this PR #77 were reverted.

I try to test functionality anyway:

• When I assign Resouce Booking the corresponding JobCandidate became 'selected'.
• But if I cancel Job, corresponding Resource Booking and JobCandidates are not cancelled.

[imcaizheng]

@maxceem
Please accept this PR topcoder-platform/taas-es-processor#5 for taas-es-processor and try again. Resource Booking and JobCandidates could be properly cancelled after that.

EDIT
Please continue with #85. The merge conflict is resolved there.