bug fix for rich html editor's image uploader dialog box not showing on small screen (eg. phone)
Update _html_editor.css.scss

change tabs to 2x whitespaces
asm.max_grade is nil when there is no questions in an assessment, fixed
Merge pull request #282 from sohymg/development

bug fix for rich html editor's image uploader dialog box not showing on ...
Merge pull request #285 from wangqiang1208/bugfixing/empty-asessments

fix for "nil can't be coerced into Float"