Add base line for retriving blcok.

It seems be fixed in Xcode 6.3.1

Kingfisher.xcodeproj/xcshareddata/xcbaselines/D1ED2D3E1AD2D09F00CFC3EB.xcbaseline/74237B0B-7981-4A24-B6C4-95F4A5E7727F.plist

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>classNames</key>
+	<dict>
+		<key>ImageCacheTests</key>
+		<dict>
+			<key>testRetrivingImagePerformance()</key>
+			<dict>
+				<key>com.apple.XCTPerformanceMetric_WallClockTime</key>
+				<dict>
+					<key>baselineAverage</key>
+					<real>0.27</real>
+					<key>baselineIntegrationDisplayName</key>
+					<string>Local Baseline</string>
+				</dict>
+			</dict>
+		</dict>
+	</dict>
+</dict>
+</plist>

Kingfisher.xcodeproj/xcshareddata/xcbaselines/D1ED2D3E1AD2D09F00CFC3EB.xcbaseline/Info.plist

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>runDestinationsByUUID</key>
+	<dict>
+		<key>74237B0B-7981-4A24-B6C4-95F4A5E7727F</key>
+		<dict>
+			<key>localComputer</key>
+			<dict>
+				<key>busSpeedInMHz</key>
+				<integer>100</integer>
+				<key>cpuCount</key>
+				<integer>1</integer>
+				<key>cpuKind</key>
+				<string>Intel Core i7</string>
+				<key>cpuSpeedInMHz</key>
+				<integer>3500</integer>
+				<key>logicalCPUCoresPerPackage</key>
+				<integer>8</integer>
+				<key>modelCode</key>
+				<string>iMac14,2</string>
+				<key>physicalCPUCoresPerPackage</key>
+				<integer>4</integer>
+				<key>platformIdentifier</key>
+				<string>com.apple.platform.macosx</string>
+			</dict>
+			<key>targetArchitecture</key>
+			<string>x86_64</string>
+			<key>targetDevice</key>
+			<dict>
+				<key>modelCode</key>
+				<string>iPhone7,2</string>
+				<key>platformIdentifier</key>
+				<string>com.apple.platform.iphonesimulator</string>
+			</dict>
+		</dict>
+	</dict>
+</dict>
+</plist>

KingfisherTests/ImageCacheTests.swift

@@ -159,9 +159,6 @@ class ImageCacheTests: XCTestCase {
         let expectation = self.expectationWithDescription("wait for retriving image")
         
         self.cache.storeImage(testImage, forKey: testKeys[0], toDisk: true) { () -> () in
-            
-            // Base line is ~0.25 in iPhone 6 simulator.
-            // (Baseline setting for block measure is not available for using in Xcode 6.3 & Swift 1.2)
             self.measureBlock({ () -> Void in
                 for _ in 1 ..< 1000 {
                     self.cache.retrieveImageInDiskCacheForKey(testKeys[0])