Re-add 1.4 counter code. Make counters in 2.0 backwards compatible
Update v1 counter for v2 API
Add a no-op inc/dec by zero to pncounter

Update test to use legacy mod
@TODO add tests for othe mods/generalize kv_crdt_eqc
V1 binary encode kv counters

Use capabilities in pb service
Remove bucket type support from legacy API

You can have that in the new API
Add support for using 1.4 style counters via the 2.0 API

Still not sure of the argument as to why, but it was compelling
enough that I did the work.
Address review comments
Don't return riak_kv_pb_counter state for a crdt message
Merge branch 'develop' into feature/rdb/count-back

Conflicts:
	src/riak_kv_pb_crdt.erl
	src/riak_kv_web.erl
Fix merge error
Add new fsm retry option to counters

Do not allow bucket type operations on v1.4 counters
TODO: there seems to be a <<"default">> bucket prefix path added
for CRDTs, I think this is a mistake.
Remove CRDT HTTP API endpoint, there isn't one yet
Merge pull request #697 from basho/feature/rdb/count-back

Re-introduce the 1.4 counters API