Removed separate tracking of keys for list items; each list item now tracks its own keys.
Merge branch 'master' into simplify_list_keys

Conflicts:
	android/src/main/java/com/thebluealliance/androidclient/adapters/NavigationDrawerAdapter.java
	android/src/main/java/com/thebluealliance/androidclient/background/PopulateEventList.java
	android/src/main/java/com/thebluealliance/androidclient/background/PopulateTeamList.java
	android/src/main/java/com/thebluealliance/androidclient/background/event/PopulateEventAwards.java
	android/src/main/java/com/thebluealliance/androidclient/background/event/PopulateEventRankings.java
	android/src/main/java/com/thebluealliance/androidclient/background/event/PopulateEventStats.java
	android/src/main/java/com/thebluealliance/androidclient/background/event/PopulateEventTeams.java
Merge pull request #64 from the-blue-alliance/simplify_list_keys

Simplified handling of keys