Update dependencies to point to tags for 2.0

Author: jaredmorrow

rebar.config

@@ -12,7 +12,7 @@
   {kvc, ".*",
    {git, "git://github.com/etrepum/kvc.git", {tag, "v1.3.0"}}},
   {riak_kv, ".*",
-   {git, "git://github.com/basho/riak_kv.git", {branch, "2.0"}}}
+   {git, "git://github.com/basho/riak_kv.git", {tag, "2.0.0"}}}
  ]}.
 
 {pre_hooks, [{compile, "./tools/grab-solr.sh"}]}.