added a context menu item to update public keys via key server, adding a key id look up Intent for the key server query

Update issue 9
Status: Fixed
Added public key update via key server. Considering this issue fixed now. More key server features will be added, but general support is added.

res/values/strings.xml

@@ -90,6 +90,7 @@
     <string name="menu_search">Search</string>
     <string name="menu_help">Help</string>
     <string name="menu_keyServer">Key Server</string>
+    <string name="menu_updateKey">Update</string>
 
     <!-- label_lowerCase: capitalized words, no punctuation -->
     <string name="label_sign">Sign</string>