Merge pull request #19 from jangrewe/master

Unify local git version check
Added support for memcache xcache and apc
Forgot some semicolons, oops!
And again!
Added defined checks around memcache
Getting ready for new installer options.
Starting installer class changes
Changed db_cache define names
CACHEOPT_MEMCACHE_SERVER && CACHEOPT_MEMCACHE_PORT

... need to be renamed, too ;-)
Merge pull request #21 from jangrewe/patch-1

CACHEOPT_MEMCACHE_SERVER && CACHEOPT_MEMCACHE_PORT
Update README.md