Added ability to display Activities in CSV format in html page

https://jira.ets.berkeley.edu/jira/browse/CYB-59

Still need to be clear on whether we want the CSV to be downloaded or just displayed on the web page
If this is not be a download file, but rather a page render of the CSV data, then it will be under app/controllers.   You'll also need a { layout: false} so that it just renders as a whole window page, and won't be a list of CSV inside any frames (including Canvas), which would have to be for the user to be able to do a File->Save from the browser menu.