Breaking activities into fragments
-added icons to represent calendar, repeating event, and event instance

AdvancedSettingsActivity:
-changed to be a container for AdvancedSettingsFragment

AdvancedSettingsFragment:
-moved layout and code from activity to fragment

SettingsActivity:
-changed to be a container for MainSettingsFragment and AdvancedSettingsFragment (if displayed on tablet)

MainSettingsFragment:
-moved layout and code from activity to fragment
-optionally displays the header and link to advanced settings

SelectCalendarsActivity:
-changed to be a container for SelectCalendarsFragment
-displays as a dialog on large display devices

SelectCalendarsFragment:
-moved layout and code from activity to fragment
-made settings icon larger so its an easier target
-fixed bug where checkbox in listview could be toggled instead of passing the click to the layout below (fixes #16)
-adjusted layout so that the checkbox and icons are fixed in place, and the middle textview is clipped (fixes #19)

AboutActivity:
-added menu item to redisplay the first-run tutorial

MainActivity:
-adjusted showFirstRunWizardIfNeeded() to only display the tutorial once (instead of every time the activity is started)
-added a warning to the top of the listview to indicate that the service has been disabled in settings
-events that should be ignored (all day and/or available events) display as ignored (fixes #15)
-action button no longer uses fade animation (fixes #4)

TutorialRingerSourceFragment:
-adjusted to use new layout

TutorialEndFragment:
-new fragment to display close button (static one in TutorialActivity needs to be removed)