add support for fee customization

Signed-off-by: Matias Alejo Garcia <ematiu@gmail.com>

public/views/preferences.html

@@ -77,6 +77,14 @@
         {{preferences.selectedAlternative.name}}
       </span>
     </li>
+    <li class="line-b p20" ng-click="$root.go('preferencesFee')">
+      <span translate>Bitcoin Network Fee Policy</span>
+      <span class="right text-gray">
+        <i class="icon-arrow-right3 size-24 right"></i>
+        {{preferences.feeName}}
+      </span>
+    </li>
+ 
     
     <li class="line-b p20" ng-click="$root.go('preferencesBwsUrl')">
       <span>Bitcore Wallet Service</span>