[47869323] db migration to support JD's seat counting and candidates' multi assessment

1 For JD, we need support vacancy counting and filled counting.
2 We need support assessments multi-times for candidates after 1+ round of interviews.
3 Also cleanup some code.

Signed-off-by: Henry Chen <hchen@vmware.com>
rename migration file to indicate the purpose
Signed-off-by: Henry Chen <hchen@vmware.com>
Merge pull request #75 from Henry-CF/candidate

[47869323] db migration for JD's seat counting and assement
Merge pull request #76 from wgu/master

enable remember me
init commit for candidate/interview status supporting

Signed-off-by: Henry Chen <hchen@vmware.com>
[PT 47858221 & 47858085] dashboard implementation
Merge pull request #79 from Chunjie/master

[PT 47858221 & 47858085] dashboard implementation
[Bug 47948765] fix bug

  Delete button is not on the same row on job opening list page
Merge branch 'master' of github.com:vmw-tmpst/heroapp-LetsHire into status
[46356433] interview feedback & assessment support

Other changes include:
[46358517] view candidate assessment
support 'potential interviewers' search&selection
improve usability by add several links between pages

Signed-off-by: Henry Chen <hchen@vmware.com>
Merge pull request #80 from Chunjie/master

[Bug 47948765] fix bug
Merge pull request #81 from Henry-CF/status

candidate/interview status supporting
[48046699] UI change in candidate detail page
Merge branch 'master' of https://github.com/vmw-tmpst/heroapp-LetsHire

Conflicts:
	app/views/candidates/show.html.slim