WIP Gleez Core Cache with prefix
Merge pull request #299 from sergeyklay/master

Minor additions and cleanups
Update Feature: Update cerber theme
New feature: Merge cache in to core with improvements.

The cache module is merged into core with many improvements like prefix
etc, it is WIP for new changes, escipally useful in shared hosting or
 shared service, add/delete cache entries belongs to that site/app should
allowed.
Updated feature: Fully merged cache guide/tests into Gleez Core
Update Feature: Add pattern and prefix docs in cache user guide
Fixed Issue: Gleez userguide cleanup
Fixed issue: some cache claees cleanup
New feature: Now we use Gleez_Validation as abstract base Validation class. As an example, I implemented Validation_Contact class
Updated feature: Increase the version number in accordance with the Gleez Versioning
Fixed issue: Fixed Email calls
Fixed issue: Fixed field name in contact form
Updated translation: Amended Russian