Hellosct1 webext (#237)

* README.md

1st commit

* New demo with devtools and the webextensions

* evolution script example

* Remove commented out code, to see if it triggers a Travis build

* Updated README; added more descriptive labels for buttons

* Added some comments

* update evolution

* correction

* correction next

* correction next

* update script for jquery

* update part jquery in the devtools

* Remove jQuery check from handleResult

devtools-panels/background_scripts/background.js

@@ -0,0 +1,23 @@
+
+/**
+When we receive the message, execute the given script in the given
+tab.
+*/
+function handleMessage(request, sender, sendResponse) {
+ 
+  if (sender.url != browser.runtime.getURL("/devtools/panel/panel.html")) {
+    return;
+  }
+
+  browser.tabs.executeScript(
+    request.tabId, 
+    {
+      code: request.script
+    });
+  
+}
+
+/**
+Listen for messages from our devtools panel.
+*/
+browser.runtime.onMessage.addListener(handleMessage);