Update Makefile and Package.swift

Makefile

@@ -1,3 +1,12 @@
+prefix ?= /usr/local
+bindir = $(prefix)/bin
+
 install:
 	swift build -c release
-	install .build/release/ScoutCLT /usr/local/bin/scout 
+	install .build/release/ScoutCLT "$(bindir)/scout"
+	
+uninstall:
+	rm -f "$(bindir)/scout" 
+	
+clean:
+	rm -rf .build

Package.swift

@@ -5,15 +5,16 @@ import PackageDescription
 
 let package = Package(
     name: "Scout",
-    platforms: [.macOS("10.13")],
+    platforms: [.macOS("10.13"), .iOS("10.0"), .tvOS("9.0"), .watchOS("3.0")],
     products: [
-        // Products define the executables and libraries produced by a package, and make them visible to other packages.
         .library(
             name: "Scout",
             targets: ["Scout"]),
+        .executable(
+            name: "ScoutCLT",
+            targets: ["ScoutCLT"])
     ],
     dependencies: [
-        // Dependencies declare other packages that this package depends on.
         .package(
             url: "https://github.com/tadija/AEXML.git",
             from: "4.5.0"),
@@ -22,8 +23,6 @@ let package = Package(
             from: "0.0.1")
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
         .target(
             name: "Scout",
             dependencies: ["AEXML"]),