added manifest.json. And bootstrap. Also added a toggleable button.

.gitignore

@@ -0,0 +1 @@
+bower_components

background.js

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+var pluginEnabled = true;
+
+function updateIcon () {
+  var selectedIcon;
+  if (pluginEnabled) {
+    chrome.browserAction.setIcon({path:'icon2.png'});
+    pluginEnabled = false;
+  } else{
+    chrome.browserAction.setIcon({path:'icon1.png'});
+    pluginEnabled = true;
+  };
+}
+
+chrome.browserAction.onClicked.addListener(updateIcon);
+
+updateIcon();

bower.json

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+{
+  "name": "tag-youre-it",
+  "version": "0.0.1",
+  "homepage": "https://github.com/nilsnh/tag-youre-it",
+  "authors": [
+    "Nils Norman Haukås <nils@thunki.com>"
+  ],
+  "description": "A browser extension for semantic tagging of words",
+  "main": "main.js",
+  "keywords": [
+    "semantic",
+    "web",
+    "tagging"
+  ],
+  "license": "MIT",
+  "ignore": [
+    "**/.*",
+    "node_modules",
+    "bower_components",
+    "test",
+    "tests"
+  ],
+  "dependencies": {
+    "bootstrap": "~3.3.5"
+  }
+}

manifest.json

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+{
+  "name": "Tag you're it",
+  "description": "Make the meaning clear. This plugin enables you to tag words on web sites with semantic meaning.",
+  "version": "0.7",
+  "permissions": [""],
+  "background": {
+    "persistent": false,
+    "scripts": ["background.js"]
+  },
+  "browser_action": {
+      "name": "Click to enable or disable tagging"
+  },
+  "manifest_version": 2
+}