Make NSBundle non-optional

as there where some subtile bugs with this and the bundle should be known for everthing at runtime.

Author: mac-cain13

Library/Core/FileResource.swift

@@ -10,8 +10,8 @@ import Foundation
 
 public protocol FileResourceType {
 
-  /// Bundle this file is in or nil for main bundle
-  var bundle: NSBundle? { get }
+  /// Bundle this file is in
+  var bundle: NSBundle { get }
 
   /// Name of the file file on disk
   var name: String { get }
@@ -27,7 +27,7 @@ public extension FileResourceType {
    - returns: The full pathname for this resource or nil if the file could not be located.
    */
   func path() -> String? {
-    return bundle?.pathForResource(self)
+    return bundle.pathForResource(self)
   }
 
   /**
@@ -36,21 +36,21 @@ public extension FileResourceType {
    - returns: The file URL for this resource or nil if the file could not be located.
    */
   func url() -> NSURL? {
-    return bundle?.URLForResource(self)
+    return bundle.URLForResource(self)
   }
 }
 
 public struct FileResource: FileResourceType {
-  /// Bundle this file is in or nil for main bundle
-  public let bundle: NSBundle?
+  /// Bundle this file is in
+  public let bundle: NSBundle
 
   /// Name of the file file on disk
   public let name: String
 
   /// Extension of the file on disk
   public let pathExtension: String
 
-  public init(bundle: NSBundle?, name: String, pathExtension: String) {
+  public init(bundle: NSBundle, name: String, pathExtension: String) {
     self.bundle = bundle
     self.name = name
     self.pathExtension = pathExtension

Library/Core/ImageResource.swift

@@ -10,22 +10,22 @@ import Foundation
 
 public protocol ImageResourceType {
 
-  /// Bundle this image is in or nil for main bundle
-  var bundle: NSBundle? { get }
+  /// Bundle this image is in
+  var bundle: NSBundle { get }
 
   /// Name of the image
   var name: String { get }
 }
 
 public struct ImageResource: ImageResourceType {
 
-  /// Bundle this image is in or nil for main bundle
-  public let bundle: NSBundle?
+  /// Bundle this image is in
+  public let bundle: NSBundle
 
   /// Name of the image
   public let name: String
 
-  public init(bundle: NSBundle?, name: String) {
+  public init(bundle: NSBundle, name: String) {
     self.bundle = bundle
     self.name = name
   }

Library/Core/NibResource.swift

@@ -12,7 +12,7 @@ import Foundation
 public protocol NibResourceType {
 
   /// Bundle this nib is in or nil for main bundle
-  var bundle: NSBundle? { get }
+  var bundle: NSBundle { get }
 
   /// Name of the nib file on disk
   var name: String { get }

Library/Core/StoryboardResource.swift

@@ -10,8 +10,8 @@ import Foundation
 
 public protocol StoryboardResourceType {
 
-  /// Bundle this storyboard is in or nil for main bundle
-  var bundle: NSBundle? { get }
+  /// Bundle this storyboard is in
+  var bundle: NSBundle { get }
 
   /// Name of the storyboard file on disk
   var name: String { get }