initial version w/ size limit
Merge remote-tracking branch 'origin/jd-cuttlefish' into feature/pevm-metadata-cache
make cache disablable
- add overload for vnode_status commands
- add handling for overload messages
Remove reset functionality from bucket-type API.
Remove DELETE from guard since it was removed from allowed_methods.
2i improvements added in 1.4.4-1.4.6

* Add 2i term regex filter
* Make 2i pagination sort optional
* Use sext NIF (C implementation)
* Fix vnode sending > max_results items for 2i query
* Add 2i AAE command
* Fix some mixed cluster queries (1.3.x and 1.4.2)
* Make memory backend obey 2i return terms properly
Add CRDT stats to get FSM and client APIs

* Change riak_kv_crdt:value/2 to return stats about the datatype as
  well.
* Send the CRDT Mod into the get FSM so we know what kind of datatype
  is being fetched when we record stats.
* Add the CRDT module into the get_fsm stat update and parameterize
  stats by whether a CRDT was used.
* Record pure CRDT stats like actor_count outside the FSM.
Fix kv_crdt_eqc module.
Fix riak_kv_crdt:eqc_test_/0.
Add CRDT stats to put FSM
Add timing and counters for CRDTs to vnode
Added CRDT Stats
Change application:get_env/3 to app_helper:get_env/3.
Fix bad pattern-match in CRDT stats code.
Rename vnode_dt_merge stats to general object merge stats
Fix test compilation step.
Merge pull request #745 from basho/feature/sdc/crdt-stats

Add CRDT stats
Merge pull request #773 from basho/refactor/sdc/remove-bucket-type-reset

Remove reset functionality from bucket-type API.
Add overload info to vnode status response

riak_kv_console expects a list of status responses for a vnode_status
request. This change has the overload return fit the structure
of non-overload returns. This way a single overloaded vnode
doesn't stop all status messages.

Also noticed that a preflist entry of {partion(), pid()} does not
get dropped by overload handling, while {partition(), node()} does.

Changes riak_kv_status to use the overload droppable style, should
I have?