updated to current spymemcached and couchbase client

the spymemcached and his membase functions has been splitted into 2 separate libraries. added the new one and updated spymemcached to current version.

maybe the dependency jars on the docu for the tomcat lib dir have to be updated: http://www.couchbase.com/develop/java/current
```
jettison-1.1.jar
netty-3.5.5.Final.jar
commons-codec-1.5.jar
httpcore-4.1.1.jar
httpcore-nio-4.1.1.jar
```
it is possible to create a release after this pull request?