Create lockdown test for tag cloud

The tag cloud appears to have 100% code coverage, but it turns out that
there are no assertions regarding this part of the code, it just runs
without raising any exceptions.

Run the lockdown test with `bundle exec rake test:lockdown`.

The lockdown test is an `approval` test, meaning that whatever you
previously approved is considered the correct result.

The first time you run the test there is no previously approved result,
so the test will fail.

To make it pass copy the `.lockdown/received.html` file to
`.lockdown/approved.html`. By doing this you _approve_ the current
output as being correct.

If you run `bundle exec rake test:lockdown` again, the test should pass.
add awesome print
add .rbenv-version
add TagCloud model
refactor get_stats_tag into TagCloud model
clean up TagCloud
clean up TagCloud variable names
TagCloud: refactor sql to methods
de-dupe TagCloud sql
TagCloud separate out cutoff logic
clean up tag view
dry up tag index view
clean up CloudTags more
TagCloud: refactor away compute method
extract out tag view logic into TagCloud and a view helper
Merge branch 'iteration10'