use Oj instead of JSON to generate and parse json string

jrpc.gemspec

@@ -19,6 +19,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency 'netstring'
   spec.add_dependency 'net_tcp_client', '>= 1.0.2'
+  spec.add_dependency 'oj'
 
   spec.add_development_dependency 'bundler', '~> 1.10'
   spec.add_development_dependency 'rake', '~> 10.0'

lib/jrpc/base_client.rb

@@ -1,4 +1,4 @@
-require 'json'
+require 'oj'
 require 'forwardable'
 module JRPC
   class BaseClient
@@ -22,8 +22,8 @@ def invoke_request(method, *params)
       id = generate_id
       request['id'] = id
 
-      response = send_command JSON.generate(request)
-      response = JSON.parse response
+      response = send_command Oj.dump(request)
+      response = Oj.load(response)
 
       validate_response(response, id)
       parse_error(response['error']) if response.has_key?('error')

spec/tcp_client_spec.rb

@@ -1,5 +1,6 @@
 require 'spec_helper'
 require 'logger'
+require 'json'
 
 describe JRPC::TcpClient do