Increasing the time stuff is cached in debug mode

With the new vagrant machines the reasons for reducing the cache time in development mode are very few.
One might argue that it helps in development since you don't have to worry about cached things, but it actually makes things harder,
there is no way to test that your feature is caching correctly and any hidden bugs related to cache will not be caught.
Using a consistent with CakePHP cache debug time
Merge pull request #1 from lorenzo/develop

Increasing the time stuff is cached in debug mode