Merge pull request #43 from mxcl/Bundle.executable

Add Bundle.executable

Sources/Extensions.swift

@@ -34,6 +34,11 @@ public extension Bundle {
     var path: Path {
         return Path(string: bundlePath)
     }
+    
+    /// Returns the executable for this bundle, if there is one, not all bundles have one hence `Optional`.
+    var executable: Path? {
+        return executablePath.flatMap(Path.init)
+    }
 }
 
 /// Extensions on `String` that work with `Path` rather than `String` or `URL`

Tests/PathTests/PathTests.swift

@@ -403,6 +403,7 @@ class PathTests: XCTestCase {
             XCTAssertEqual(bndl.privateFrameworks, tmpdir.Frameworks)
             XCTAssertEqual(bndl.resources, tmpdir)
             XCTAssertNil(bndl.path(forResource: "foo", ofType: "bar"))
+            XCTAssertNil(bndl.executable)
 
         #if os(macOS)
             XCTAssertEqual(bndl.defaultSharedFrameworksPath, tmpdir.Contents.Frameworks)