Use z-index to put panel on top of all DOM elements

Without z-index attribute, there can be cases when panel is below DOM elements and can not show correctly.
99999 is enough for z-index
Merge pull request #205 from minde/3.0

Use z-index to put panel on top of all DOM elements
ObjectRegistry moved in CakePHP.
Re-order use statements.
Start basics of CachePanel.

The cache panel will track which operations were done and add timers for
each operation.
Very crude Cache panel element.
Wire up CachePanel a bit more.
Hacky way to proxy cache engines without eagerly building instances.
Get read only panel 'working'

I'm not sure it handles all the edge cases yet, and it has no test
cases, but it appears to work in simple use cases.
Start to build the code needed to clear a cache from the toolbar.
Update panel routes.
Start test for cache clearing.
Fix tests and add error test cases.
Fix routing mistakes.
Make buttons prettier.
Add animation when cache is cleared.
Add tests for Cache Proxy.
Fix VERSION.txt
Fix global variable and improve timer names.