fixed to re-create the userEx data, when the screenName & imageURL is
updated.
removing user is not necessary, since userAccessDao.put can update the data
made a button to recreate, but JSON will be shown in browser
use Ajax request to prevent showing JSON in browser
Merge pull request #455 from eller86/fix-issue-454

Fix recreateLuceneIndex button in admin page
add test case for cache-control and content-type to close #380
modified to using ObjectUtils & updating user data.
use better naming to tell intent. refs #456
modified to omit the unnecessary dao.put
Merge pull request #448 from takei-shg/takei-shg

fixed issues: refs #409, #447
Merge pull request #456 from eller86/380-test-for-api-header

add test case for cache-control and content-type to close #380