Merge branch 'en-support_testnet_explorers'

* en-support_testnet_explorers:
  Added testnet etherscan explorers
  Increased version number

manifest.json

@@ -4,7 +4,7 @@
   "name": "EtherAddressLookup",
   "short_name": "EtherAddressLookup",
   "description": "Adds links to strings that look like Ethereum addresses to your favorite blockchain explorer.",
-  "version": "1.13.1",
+  "version": "1.13.2",
 
   "browser_action": {
     "default_icon": "images/icon.png",

options.html

@@ -44,10 +44,21 @@ <h3 class="text-center">EtherAddressLookup</h3>
     <label>Preferred Blockchain Explorer</label>
     <select class="form-control" name="ext-etheraddresslookup-choose_blockchain"
             id="ext-etheraddresslookup-choose_blockchain">
-        <option value="https://etherscan.io/address">Etherscan.io *</option>
-        <option value="https://etherchain.org/account">Etherchain.org *</option>
-        <option value="https://ethplorer.io/address">Ethplorer.io</option>
-        <option value="http://ethergraphs.com/dashboard">Ethergraphs.com</option>
+        <optgroup label="Mainnet">
+            <option value="https://etherscan.io/address">Etherscan.io *</option>
+            <option value="https://etherchain.org/account">Etherchain.org *</option>
+            <option value="https://ethplorer.io/address">Ethplorer.io</option>
+            <option value="http://ethergraphs.com/dashboard">Ethergraphs.com</option>
+        </optgroup>
+        <optgroup label="Rinkeby">
+            <option value="https://rinkeby.etherscan.io/address">Etherscan.io *</option>
+        </optgroup>
+        <optgroup label="Ropsten">
+            <option value="https://ropsten.etherscan.io/address">Etherscan.io *</option>
+        </optgroup>
+        <optgroup label="Kovan">
+            <option value="https://kovan.etherscan.io/address">Etherscan.io *</option>
+        </optgroup>
     </select>
     <div class="note">
         <small>* ENS address compatible.</small>