Added retry button on timeline error message
Updated tasks file
Progress wheel shows up again when retry

On the timeline, if you click retry the other views will be hidden and
the progress wheel will show up again.
Updated timeline fragment with comments/minor fix

Moved code out of the no args constructor because that is a requirement
for Android. Added more comments to help clarify code. Created login
fragment but it isn't ready yet
Finished login fragment

The login fragment now has its UI completely built although the login
functionality doesnt work yet.
Changed user and individual event frag to activity

It is hard to replace a fragment in a view pager so instead we just
start a new activity instead.
All activities open correctly

The individual event activity and the user activity open correctly