LUN-1507 : Style calendar for start publication & end publication
entry credit/caption can be blank;
Merge branch 'master' into LUN-1507

Conflicts:
	cms_blogger/static/cms_blogger/css/entry-change-form.css
Query for next post should have ASC ordering
LUN-1507 : Style poster image admin, expand error fields when collapsed
Merge branch 'master' into LUN-1507
Merge pull request #4 from laurafeier/LUN-1507

Lun 1507
merge with master