Fix ArsModelDownloads which caused Akeeba Live Update to malfunction and likely caused the blank item page issue

Blank item page issue: https://www.akeebabackup.com/support/akeeba-release-system/17087-blank-item-page.html
Fix undefined $size variables. I think this is ok, but please verify.
Merge pull request #7 from jurianeven/fix-ArsModelDownloads

Fixes for ArsModelDownloads
Fix undefined $params in frontend templates
Merge pull request #8 from jurianeven/fix-params

Fix undefined $params in frontend templates
Regression: latest items not showing
Installation broken when using Discover
Add page heading to dlidlabels view
Merge pull request #9 from jurianeven/pageheading

Add page heading to dlidlabels view
JSON may be removed in some PHP 5.5 distributions because the JSON format specification's author and Linux distro makers are sizing up their dicks. We are caught amidst a dick-fight. Therefore even though we can't fix stupid we can at least try to work around it. For fuck's sake!
Close #10
Do not install FOF on Joomla! 3.2 and later
Language update
Changelog update
Merge branch 'release/2.2.0' into development
Workaround for broken JSON API
! Access Levels not respected during download
! An annoying –but harmless– fatal error was shown on upgrade from older versions
Added PHPStorm files to the ignore list
gh-11
Updated db schema