[49574475] basic func for interviewers' selection modal dialog

Support multiple interviewers' selection

Signed-off-by: Henry Chen <hchen@vmware.com>
[49574475] cleanup outdated interview edit function

Simplify old edit-interview interface to a simple feedback API

Signed-off-by: Henry Chen <hchen@vmware.com>
Merge branch 'master' of git://github.com/vmw-tmpst/heroapp-LetsHire into sched_interviews

Signed-off-by: Henry Chen <hchen@vmware.com>

Conflicts:
	app/controllers/interviews_controller.rb
	app/models/interview.rb
	app/models/opening.rb
	app/views/interviews/_interview.html.slim
Merge branch 'master' of https://github.com/vmw-tmpst/heroapp-LetsHire into sched_interviews
Merge pull request #1 from Henry-CF/sched_interviews

Sched interviews
[48381403] update the link 'schedule interviews' within new candidate page

Signed-off-by: Henry Chen <hchen@vmware.com>
[49574475] Support interviewers' selection

code refactor

Signed-off-by: Henry Chen <hchen@vmware.com>
Merge pull request #165 from Henry-CF/sched_interviews

[49574475] Support interviewers' selection