JSCBC-83: Fixed multi operation arithmetic operation.
JSCBC-83: Fixed multi operation arithmetic operation.

Removed incorrect incrMulti and decrMulti (which don't actually
exist) and replaced them with the correct method, arithmeticMulti.

Change-Id: I1271485c5e3fabf772efe7374616f934ab83bf10
Reviewed-on: http://review.couchbase.org/30792
Reviewed-by: Matt Ingenthron <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@couchbase.com>
Tested-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>

jess-sheneberger/couchnode,actano/couchnode,kshmir/couchnode,GannettDigital/couchnode,ConnectedHomes/couchnode,ConnectedHomes/couchnode,jess-sheneberger/couchnode,KenanSulayman/couchnode,Bloutiouf/couchnode,kshmir/couchnode,corbinu/couchnode,corbinu/couchnode,Bloutiouf/couchnode,brett19/couchnode,GannettDigital/couchnode,ConnectedHomes/couchnode,KenanSulayman/couchnode,couchbase/couchnode,kshmir/couchnode,actano/couchnode,couchbase/couchnode,brett19/couchnode,couchbase/couchnode,couchbase/couchnode,Bloutiouf/couchnode,GannettDigital/couchnode,KenanSulayman/couchnode,KenanSulayman/couchnode,brett19/couchnode,corbinu/couchnode,jess-sheneberger/couchnode,actano/couchnode,jess-sheneberger/couchnode,ConnectedHomes/couchnode,Bloutiouf/couchnode