feat(places): add getObject method

Author: spinach

Source/PlacesClient.swift

@@ -89,4 +89,15 @@ import Foundation
         let request = ["params": params.build()]
         return performHTTPQuery(path: "1/places/query", method: .POST, body: request, hostnames: self.readHosts, isSearchQuery: true, completionHandler: completionHandler)
     }
+    
+    /// Get a place by its objectID.
+    ///
+    /// - parameter objectID: Identifier of the object to retrieve.
+    /// - parameter completionHandler: Completion handler to be notified of the request's outcome.
+    /// - returns: A cancellable operation.
+    ///
+    @objc
+    @discardableResult public func getObject(withID objectID: String, completionHandler: @escaping CompletionHandler) -> Operation {
+        return performHTTPQuery(path: "1/places/\(objectID.urlEncodedPathComponent())", method: .GET, body: nil, hostnames: self.readHosts, completionHandler: completionHandler)
+    }
 }

Tests/PlacesClientTests.swift

@@ -57,4 +57,15 @@ class PlacesClientTests: XCTestCase {
         }
         self.waitForExpectations(timeout: expectationTimeout, handler: nil)
     }
+    
+    func testGetObject() {
+        let expectation = self.expectation(description: #function)
+        
+        places.getObject(withID: "171457082_7444") { (content, error) in
+            XCTAssertEqual("171457082_7444", content!["objectID"] as! String)
+            expectation.fulfill()
+        }
+        
+        self.waitForExpectations(timeout: expectationTimeout, handler: nil)
+    }
 }