Add documentation for getObject()

Author: Carlos Diaz-Padron

src/main/java/com/twilio/sdk/resource/InstanceResource.java

@@ -75,6 +75,12 @@ public String getProperty(String name) {
 				+ " is an object.  Use getObject() instead.");
 	}
 
+  /**
+   * Gets the property as an Object.
+   *
+   * @param name the name of the property
+   * @return the property as an Object
+   */
 	public Object getObject(String name) {
 	    	Object prop = getAndLoadIfNecessary(name);