Rename uikit/CSSLayout to CSSLayoutKit.

Summary:
When trying to integrate this into an Xcode project that already included CSSLayout.[c|h], we were getting a linker error.

Upon digging in, I found out that Xcode was becoming confused because the imports of the uikit library and the c library are both `#import <CSSLayout/CSSLayout.h>`. So, it needed a new name.

Reviewed By: emilsjolander

Differential Revision: D4162621

fbshipit-source-id: b5f7624eb29f1b9eaebbed5104ec9ea8a12ad2e5

CSSLayoutKit/BUCK

@@ -0,0 +1,41 @@
+# Copyright (c) 2014-present, Facebook, Inc.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree. An additional grant
+# of patent rights can be found in the PATENTS file in the same directory.
+
+include_defs('//CSSLAYOUT_DEFS')
+
+UIKIT_CSSLAYOUT_COMPILER_FLAGS = ['-fobjc-arc']
+
+apple_library(
+  name = 'CSSLayoutKit',
+  compiler_flags = UIKIT_CSSLAYOUT_COMPILER_FLAGS,
+  tests = [':CSSLayoutKitTests'],
+  srcs = glob(['*.m']),
+  exported_headers = glob(['*.h']),
+  frameworks = [
+    '$SDKROOT/System/Library/Frameworks/Foundation.framework',
+    '$SDKROOT/System/Library/Frameworks/UIKit.framework',
+  ],
+  deps = [
+    csslayout_dep(':CSSLayout'),
+  ],
+  visibility = ['PUBLIC'],
+)
+
+apple_test(
+  name = 'CSSLayoutKitTests',
+  compiler_flags = UIKIT_CSSLAYOUT_COMPILER_FLAGS,
+  info_plist = 'Tests/Info.plist',
+  srcs = glob(['Tests/**/*.m']),
+  frameworks = [
+    '$SDKROOT/System/Library/Frameworks/CoreGraphics.framework',
+    '$PLATFORM_DIR/Developer/Library/Frameworks/XCTest.framework',
+  ],
+  deps = [
+    ':CSSLayoutKit',
+  ],
+  visibility = ['PUBLIC'],
+)