- Refactoring classes

- Add Installation Class
- Add AccessToken Class (not yet complete)
- Remove PNObjectProperty
- Move PNObjectProperty methods to "PNObject+Protected.h"

Pod/Classes/PNClasses/PNInstallation.h

@@ -0,0 +1,59 @@
+//
+//  PNInstallation.h
+//  Pods
+//
+//  Created by Giuseppe Nucifora on 27/01/16.
+//
+//
+
+#import <PNObject/PNObject.h>
+
+@interface PNInstallation : PNObject
+
+/**
+ Gets the currently-running installation from disk and returns an instance of it.
+ 
+ If this installation is not stored on disk, returns a `PFInstallation`
+ with `deviceType` and `installationId` fields set to those of the
+ current installation.
+ 
+ @result Returns a `Installation` that represents the currently-running installation.
+ */
++ (instancetype _Nonnull)currentInstallation;
+
+- (void)setDeviceTokenFromData:(nullable NSData *)deviceTokenData;
+
+///--------------------------------------
+#pragma mark - PNInstallation Properties
+///--------------------------------------
+
+/**
+ *  <#Description#>
+ */
+@property (nonatomic, strong, readonly, nonnull) NSString *deviceType;
+/**
+ *  <#Description#>
+ */
+@property (nonatomic, strong, readonly, nonnull) NSString *deviceModel;
+/**
+ *  <#Description#>
+ */
+@property (nonatomic, strong, readonly, nonnull) NSString *deviceName;
+/**
+ *  <#Description#>
+ */
+@property (nonatomic, strong, readonly, nonnull) NSString *osVersion;
+/**
+ *  <#Description#>
+ */
+@property (nonatomic, strong, readonly, nonnull) NSString *localeIdentifier;
+/**
+ *  <#Description#>
+ */
+@property (nonatomic, strong, readonly, nullable) NSString *deviceToken;
+/**
+ *  <#Description#>
+ */
+@property (nonatomic, assign) NSInteger badge;
+
+@end