Make debug build installable.

Have to use debug builds instead of release in Xcode 6.1 beta 2. See issue #2.

SwiftShell.xcodeproj/project.pbxproj

@@ -466,6 +466,7 @@
 				COMBINE_HIDPI_IMAGES = YES;
 				DEFINES_MODULE = YES;
 				DEPLOYMENT_LOCATION = NO;
+				DSTROOT = "~/";
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
@@ -474,7 +475,7 @@
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/Frameworks";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SKIP_INSTALL = YES;
+				SKIP_INSTALL = NO;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 			};
 			name = Debug;