Fixed error message (#37)

Author: ajbozarth

app.py

@@ -44,7 +44,7 @@
 static_img_path = "static/img/images/"
 temp_img_prefix = "MAX-"
 image_captions = collections.OrderedDict()
-VALID_EXT = ['png', 'jpg', 'jpeg', 'gif']
+VALID_EXT = ['png', 'jpg', 'jpeg']
 
 
 class MainHandler(web.RequestHandler):

static/js/webapp.js

@@ -231,7 +231,7 @@ $(function() {
                     set_img_picker();
                 },
                 error: function() {
-                    alert("Must submit a valid file (png, jpeg, jpg, or gif)");
+                    alert("Must submit a valid file (png, jpeg, or jpg)");
                 },
                 complete: function() {
                     $("#file-submit").text("Submit");