(refs #3518) add date line for smtChain template.
(refs #3518) update JS for date line. and change function not use global.
(refs #3518) add date line css.
(refs #3518) add formatted date to data-created-at-date attribute in JS.
(refs #3518) add getMemberId function in JS.
(refs #3518) update timeago class in smtListSuccess template.
(refs #3518) update JS indent.
Merge branch 't3518-add-date-line' of github.com:ShinichiU/opMessagePlugin into t-3518