Add Android stock action bar icons play, stop, replay
Merge branch 'master' into Lollipop
Merge branch 'master' into Lollipop
Merge branch 'master' into Lollipop
Keep the paused notification open; stop or dismiss it to close it

* Keep the paused notification open so it's usable on the Lollipop lock
screen in lieu of lock screen widgets.
* Show Start, Pause, and Stop actions in the notification.
* Add a Stop button to the activity.
* Add info to the notification to explain Running/Paused/Stopped state, a
tip on setting periodic reminders, and a tip on stopping/dismissing the
paused notification.

TODO:
* Freeze the notification's timer display when paused.
* Finish reworking the activity's buttons: start, pause, reset, stop.
* Switch to the new icons. Maybe color or tint them.
* Remove the activity's Start/Stop/Reset button labels.
* Make paused reset vs. stopped look different in the activity and widget
time displays.
* Update README.md.
delete-avd-locks.sh: deletes locks from crashed emulators
When paused, show the timer duration, not a chronometer

in the notification
Add a Reset button to the paused notification

so you can reset and start again on the lock screen.
Update the activity's Start/Pause/Reset/Stop buttons

* Remove the text labels from these buttons. Use icons only.
* Replace my custom icons with Android's media playback template icons.

TODO: Colorize these icons? Tint them on Lollipop?
Link to the support-v4 lib source code

Alas, Android Studio is using Windows absolute pathnames.
Use the gray template icons in the app widget
Add comments about Notification Builder OS bugs

and simplify the comment on TimeCounter#cycle().
Add comments about OS bugs that need working around.
Refactor to simplify buildNotification()
Java code style: indent, don't align method formal parameters
Workaround: Hide Paused notifications on API < 21

TODO: Hide the activity's Stop on API < 21, thus completely hiding the
distinction between Paused and Stopped which is only for Paused lock screen
notifications on API 21 Lollipop.
Hide the "Stop" feature on API < 21

... where it doesn't help to distinguish Paused from Stopped due to limits
and bugs in Notifications.