[*] Add cache class
Revert "[*] Add Fast session module"

This reverts commit 272ab6a64cd4f748f10072347dcfb59cb2ad4161.
Revert "Revert "[*] Add Fast session module""

This reverts commit 40878aae27bcc438fea4cfd2f41a69dca6a09ad4.
Merge branch 'master-dev' into s-view-cache
E:42528 [*] Update cache subsystem
E:41803 [!] Bug: _gaq object used if Google Analytics module was unconfigured. Fixed.
Merge branch 'master-dev' of github.com:litecommerce/core into master-dev
Merge branch 's-view-cache' into master-dev
[*] Small logic changes