Fixed issue: Cleanup PHPDoc. Removed _sanitize_id
Updated feature: Used System::sanitize_id instead Cache::_sanitize_id
Fixed issue: Removed _sanitize_id. Used System::sanitize_id
New feature: Added System::sanitize_id
Fixed issue: Refactoring. Rename _regxp_pattern to _regexp_pattern. Cleanup PHPDoc
Fixed issue: Now used _regexp_pattern. Cleanup PHPDoc
Updated feature: Amended PHPDoc
Fixed issue: Now using _regexp_pattern instead _regxp_pattern
Fixed issue: Fixed PHPDoc
Fixed issue: Memcache driver fixes

- Cleanup PHPDoc
- Removed deprecated parameter timeout

This deprecated parameter is not supported, and defaults to 0 seconds.
Do not use this parameter. It's not recommended to use the timeout parameter.
The behavior differs between memcached versions, but setting to 0 is safe.
Other values for this deprecated feature may cause the memcache delete to fail.
New feature: Added Cache_Apc::CACHE_TYPE const
Merge pull request #443 from sergeyklay/master

Cache improvement and fixes