Swap the Encoding used when generating hashes for keys from Unicode to UTF8
Swap the Encoding used when generating hashes for keys from Unicode to UTF8

I believe this will be more compatible with other memcached clients out there.

I did do some performance testing around the Unicode or UTF8 area as there are
some concerns that the Unicode string -> byte process is more memory efficient
(a straight memcpy) than the string -> UTF8 byte array  and conversely
that the hashing over twice as many bytes as ncessary in an ascii key world might
take longer.

My results were completely inconclusive suggesting that for over 100,000 hashes
there was no discernable difference between the two approaches.

couchbaselabs/EnyimMemcached,oceanho/EnyimMemcached,enyim/EnyimMemcached,DukeCheng/EnyimMemcachedCore,haizhixing126/EnyimMemcached,couchbase/EnyimMemcached,cnblogs/EnyimMemcachedCore,haizhixing126/EnyimMemcached,cnblogs/EnyimMemcachedCore,DukeCheng/EnyimMemcachedCore,oceanho/EnyimMemcached