added context to /courses to give it a left sidebar
added check to make sure the first report isn't nil for adding it to the context of the My Classes page
changed some more instances of the wording S to P for misconception probabilities. No longer showing the message 'This student may have the following misconceptions' in the submission history if the student does not have any of the misconceptions
refactored constructed response to have the drawing pad below the text area and widened both the text area and drawing area. fixed the answers to go directly to codecogs as well. changed user_content to gsub the fractions as well