Publish Vulpes Preview 15 sources for desktop, Android and Tundra

Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.

assets/webapps/uitest.gaiamobile.org/js/API/shareimage.js

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+var shareImage = document.querySelector("#share-image"),
+        imgToShare = document.querySelector("#image-to-share");
+    if (shareImage && imgToShare) {
+        shareImage.onclick = function () {
+            if(imgToShare.naturalWidth > 0) {
+                // Create dummy canvas
+                var blobCanvas = document.createElement("canvas");
+                blobCanvas.width = imgToShare.width;
+                blobCanvas.height = imgToShare.height;
+
+                // Get context and draw image
+                var blobCanvasContext = blobCanvas.getContext("2d");
+                blobCanvasContext.drawImage(imgToShare, 0, 0);
+
+                // Export to blob and share through a Web Activitiy
+                blobCanvas.toBlob(function (blob) {
+                    var sharingImage = new MozActivity({
+                        name: "share",
+                        data: {
+                            type: "image/*",
+                            number: 1,
+                            blobs: [blob]
+                        }
+                    });
+                });
+            }
+            else {
+                alert("Image failed to load, can't be shared");
+            }
+        }
+    }