Create a task review page

[michaelbrooks]

This should show the results of the task, while the task detail page is kind of a basic summary of the task itself. Some information it would be nice to show on this page:

• examples of what has been coded with each code (currently being shown on the task detail page)
• counts of how much each code has been used
• counts of how many codes each coder has applied

[michaelbrooks]

Some code for the view:

examples = task.get_examples()
frequency = task.get_frequency()

code_info = {}
for code,count in frequency.iteritems():
    code_info[code] = {
        'count': count,
        'examples': examples[code],
    }

context['code_info'] = code_info

[michaelbrooks]

Finished parts one and two in #102