Use screen_name instead of user_id

[ItsCalebJones]

Potential fix for issue #63

I will be using @SpaceLaunchNow (user_id= 841696172259606528) as the example account. The code as is first tries the URI - if a package is not available to handle the twitter:// URI then it falls back to the web URL.

As is the URI works ONLY with the user_id - however the web url ONLY works with the screen name.

Relevant intent logic here.

	public Intent openTwitter (String user) {
		try {
			tryPackage(R.string.id_twitter_app);
			return intent(R.string.uri_twitter_app, user);
		} catch (Exception e) {
			return intent(R.string.url_twitter_website, user);
		}
	}

Example A - URI doesn’t work but weblink does:
twitter://user?user_id= SpaceLaunchNow
https://twitter.com/SpaceLaunchNow

Example B - URI works but weblink doesnt:
twitter://user?user_id=841696172259606528
https://twitter.com/841696172259606528

The obvious solution is to use just the screen_name or just the user_id for the URI and fallback link. From what I can see the web url only accepts screen names so changing the URI to screen_name makes more sense.