Don't send back URLs in survey questions

As discussed in Issue #28, we were sending back URLs in the survey question text. This removes URLs from survey questions by allowing you to set a nickname (short name) for each question. The short name is sent back instead of the actual question text, if the question text has a URL.
chrome.storage.local.get is supposed to accept an array as the first parameter but was rejecting [cesp.SURVEYS_SHOWN_TODAY, cesp.SURVEYS_SHOWN_THIS_WEEK]. To make this work I split it up into two separate lines. All the other supposed edits on lines 288-324 are actually just the resulting change in indentation.