Layout handling in travis-web was implemented in a dynamic way, so we
could change a main layout from any of the routes. This needed a
`rerender` call which was making things harder and needed some hacks. It
also broke a few transitions when upgrading to 1.8.1.
After examining our usage of layouts I've noticed that we don't need to
change the entire layout dynamically and instead we can set layout on
root routes (like "index", "profile" and other root routes).
When first sync template is displayed, user usually doesn't have any
repos, which also triggers rendering of getting started template. The
fix for this is to handle the action to render getting started page on
first sync and do nothing in such case.
I also added a test to ensure that it works correctly.
Visibility.js provides a thin wrapper over page visibility API, which
allows to detect if page is currently visible by user. This allows us to
stop live updates when it's not needed. This is especially easy in case
of timers, because Visibility.js provides setInterval replacement, which
runs given code only when page is visible.
A lot of ❤️ for @tchack, who showed me visibility.js!
It seems that running Ember.run.later periodically can cause CPU usage
to increase over time. Such increase adds up to already increasing CPU
usage because of data amount growing.
This commit tries to mitigate the issue by using setTimeout instead
* if user is logged out, the default tab should be 'recent'
* when user logs in, the tab is switched to 'my repositories'
* when user logs out, my repositories is hidden again and tab is
switched to 'recent'
