added previous and next block links

app/src/pages/block-detail/block-detail.html

@@ -23,11 +23,11 @@
   <p>Timestamp {{ block.time }}</p>
   <p>Mined by</p>
   <p>Merkle Root {{ block.merkleroot }}</p>
-  <p>Previous Block {{ block.previousblockhash }}</p>
+  <p>Previous Block <a (click)="goToPreviousBlock()">{{ block.height - 1 }}</a></p>
   <p>Difficulty {{ block.difficulty }}</p>
   <p>Bits {{ block.bits }}</p>
   <p>Size (bytes) {{ block.size }}</p>
   <p>Version {{ block.version }}</p>
   <p>Nonce {{ block.nonce }}</p>
-  <p>Next Block {{ block.nextblockhash }}</p>
+  <p>Next Block <a (click)="goToNextBlock()">{{ block.height + 1 }}</a></p>
 </ion-content>

app/src/pages/block-detail/block-detail.ts

@@ -45,4 +45,16 @@ export class BlockDetailPage {
     console.log('ionViewDidLoad BlockDetailPage');
   }
 
+  public goToPreviousBlock() {
+    this.navCtrl.push('block-detail', {
+      'blockHash': this.block.previousblockhash
+    });
+  }
+
+  public goToNextBlock() {
+    this.navCtrl.push('block-detail', {
+      'blockHash': this.block.nextblockhash
+    });
+  }
+
 }