Update TwilioRestClient.java

Allow retrieval of the httpClient created at Constructor. That will allow users to update the properties with additional configuration such as Proxy server setup.

Author: gbvb

src/main/java/com/twilio/sdk/TwilioRestClient.java

@@ -95,6 +95,10 @@ public void setNumRetries(int numRetries) {
 	public void setHttpclient(HttpClient httpclient) {
 		this.httpclient = httpclient;
 	}
+	
+	public HttpClient getHttpClient() {
+		return httpclient;
+	}
 
 	/**
 	 * Explcitly construct a TwilioRestClient with the given API credentials.