I did a lot of changes:

- Avoid initial UIAlertView in production, if you want to use the previous behaviour you can use ```[[EMLoginService sharedInstance] setDevelopmentMode:YES]```;
- Add permissions for mail, read connectons;
- Webview with preload HTML while the real login is loading (because it is too slow);
- Change color for overview in UIWebView;
Merge pull request #1 from EDpuzzle/master

General improvement