feat(identity): add device application stamp read capability

README.md

@@ -342,6 +342,16 @@ MParticle.Identity.modify(request, (error, userId) => {
 });
 ```
 
+```js
+MParticle.Identity.getCurrentDeviceApplicationStamp((error, deviceApplicationStamp) => {
+    if (error) {
+        console.debug(error); //error is an MParticleError
+    } else {
+        console.debug(deviceApplicationStamp);
+    }
+});
+```
+
 ## Attribution
 ```
 var attributions = MParticle.getAttributions();

android/src/main/java/com/mparticle/react/MParticleModule.java

@@ -294,6 +294,12 @@ public void getCurrentUserWithCompletion(Callback completion) {
 
     }
 
+    @ReactMethod
+    public void getCurrentDeviceApplicationStampWithCompletion(Callback completion) {
+        MParticleUser deviceApplication = MParticle.getInstance().Identity().getDeviceApplicationStamp();        
+        completion.invoke(null, deviceApplication);
+    }
+
     @ReactMethod
     public void aliasUsers(final ReadableMap readableMap, final Callback completion) {
         IdentityApi identityApi = MParticle.getInstance().Identity();

ios/RNMParticle/RNMParticle.m

@@ -345,6 +345,11 @@ + (void)load {
     completion(@[[NSNull null], [[[MParticle sharedInstance] identity] currentUser].userId.stringValue]);
 }
 
+RCT_EXPORT_METHOD(getCurrentDeviceApplicationStampWithCompletion:(RCTResponseSenderBlock)completion)
+{
+    completion(@[[NSNull null], [[[MParticle sharedInstance] identity] deviceApplicationStamp]]);
+}
+
 RCT_EXPORT_METHOD(getUserIdentities:(NSString *)userId completion:(RCTResponseSenderBlock)completion)
 {
     MParticleUser *selectedUser = [[MParticleUser alloc] init];

js/index.js

@@ -305,6 +305,16 @@ class Identity {
     NativeModules.MParticle.aliasUsers(AliasRequest, completion)
   }
 
+  static getCurrentDeviceApplicationStamp (completion) {
+    NativeModules.MParticle.getCurrentDeviceApplicationStampWithCompletion((error, deviceApplicationStamp) => {
+      if (error) {
+        var parsedError = new MParticleError(error);
+        completion(parsedError, undefined);
+        return;
+      }
+      completion(undefined, deviceApplicationStamp);
+    });
+  }
 }
 
 // ******** Commerce ********