Start share intent without chooser

This is to be consistent with other share actions in
the app.

Also use the repository id as the subject instead of
just the name.

Author: kevinsawicki

app/res/values/strings.xml

@@ -234,7 +234,6 @@
     <string name="starring_repository">Starring…</string>
     <string name="unstarring_repository">Unstarring…</string>
     <string name="navigate_to">Navigate to…</string>
-    <string name="share_repo">Share this Repo!</string>
 
     <!-- Tab titles, should be as short as possible -->
     <string name="tab_repositories">repositories</string>

app/src/main/java/com/github/mobile/ui/repo/RepositoryViewActivity.java

@@ -276,8 +276,8 @@ protected void onSuccess(Boolean watching) throws Exception {
     }
 
     private void shareRepositoryURL() {
-        Intent sharingIntent = ShareUtils.create(repository.getName(), repository.getHtmlUrl());
-        startActivity(Intent.createChooser(sharingIntent, getResources()
-                .getText(string.share_repo)));
+        Intent sharingIntent = ShareUtils.create(repository.generateId(),
+                                                 repository.getHtmlUrl());
+        startActivity(sharingIntent);
     }
 }