[imp] Remove the remember me option from the offline.php page. Fixes #1510
Restructuring JDocumentTest and JDocumentRendererTest
Merge branch 'staging' of github.com:joomla/joomla-cms into staging
[bug] Fixing a series of warnings and a fatal error when you access index.php/component/tags. Fixes #4783
Test fixes

- JFactoryTest requires a database connection
- Remove failing test in JDocumentRendererTest due to other tests invalidating the expected data
- Update a couple of places overwriting the SERVER superglobal
Merge branch 'staging' of github.com:joomla/joomla-cms into staging
Improved testcases for JModel legacy classes (Fix #4807)
Removed or fixed 'risky' tests (Fix #4805)
Move legacy JModel tests to match directory structure