Fix 500 error when deleting apps or tasks from web interface
Add new copyright to README
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Merge pull request #599 from PyBossa/issue-ip

Issue ip
Fix #600 Now the CSV export works properly

This commit sorts the keys for the header of the CSV file, and returns
the value for each key properly
Merge pull request #601 from PyBossa/issue-600-csv-exporter

Fix #600 Now the CSV export works properly
Cache the count of n_auth users
Cache number of anon users
Cache number of tasks of the site
Cache top5 24 hours apps for the site
Cache locs and users
Cache global stats