incr/decr delete their items instead of doing math

• install product - 1.6.0beta3.2b-19
• using membase as default bucket type
• telnet 11211 (moxi)
• do a set, incr, get, and you'll see the item is gone...

$ telnet 10.2.1.54 11211
Trying 10.2.1.54...
Connected to 10.2.1.54.
Escape character is '^]'.
set a 0 0 1
1
STORED
incr a 100
101
get a
END