Removed "execution" permission from Item.php
Removed unneeded/unclear comments
Reworked Memcache sub driver initialization

Merged these into the constructors so that I could eliminate the
“$options” parameter from the “Memcache extension” class, as that
extension does not use the options that Memcached is using.
Removed @todo
Fixed docblock formatting
Merge pull request #148 from tedivm/minor_refactoring

Minor refactoring