Support adding students to a cohort via the instructor dashboard.

cms/static/coffee/spec/main_spec.coffee

cms/static/coffee/spec/models/section_spec.coffee

cms/static/coffee/spec/views/assets_spec.coffee

cms/static/coffee/spec/views/course_info_spec.coffee

cms/static/coffee/spec/views/textbook_spec.coffee

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cms/static/js/common_helpers

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cms/static/js/spec/video/file_uploader_editor_spec.js

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cms/static/js/spec/views/modals/base_modal_spec.js

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cms/static/js/spec/views/pages/course_outline_spec.js