merge for release

README.md

@@ -38,13 +38,15 @@ Please refer to [Event Server documentation](https://docs.prediction.io/datacoll
 ### Instantiate Event Client and connect to PredictionIO Event Server
 
 ```ruby
+require 'predictionio'
+
 # Define environment variables.
-ENV['PIO_THREADS'] = 50 # For async requests.
+ENV['PIO_THREADS'] = '50' # For async requests.
 ENV['PIO_EVENT_SERVER_URL'] = 'http://localhost:7070'
 ENV['PIO_ACCESS_KEY'] = 'YOUR_ACCESS_KEY' # Find your access key with: `$ pio app list`.
 
 # Create PredictionIO event client.
-client = PredictionIO::EventClient.new(ENV['PIO_ACCESS_KEY'], ENV['PIO_EVENT_SERVER_URL'], ENV['PIO_THREADS'])
+client = PredictionIO::EventClient.new(ENV['PIO_ACCESS_KEY'], ENV['PIO_EVENT_SERVER_URL'], Integer(ENV['PIO_THREADS']))
 ```
 
 ### Create a `$set` user event and send it to Event Server

lib/predictionio/event_client.rb

@@ -5,6 +5,7 @@
 # License::   Apache License, Version 2.0
 
 require 'date'
+require "net/http"
 
 module PredictionIO
   # This class contains methods that interface with the PredictionIO Event