Added a temporary way to show a list of apps.
Merge branch 'feature/LocalAppDB' into feature/RecentApps

Conflicts:
	src/de/otaris/zertapps/privacychecker/HomeActivity.java
Nur kleinere Anpassungen.
Listen Adapter von Nico&Lukas übertragen.

Imports aufräumen.

Timestamp in AppDataSource und App eingepflegt.
-> App: Attribut, Getter, Setter
-> AppDataSource: getLastUpdatedApps

HomeActivity: Alte Hardcoded Zeilen entfernt.
Timestamp now UnixTimestamp.
Changed all connected methods and params.

Updated getLastUpdated method.

Added comments.
Deleted some old comments.

Added Timestamp to the column String.
Merge branch 'develop'

Conflicts:
	src/de/otaris/zertapps/privacychecker/AppListItemAdapter.java
	src/de/otaris/zertapps/privacychecker/HomeActivity.java
	src/de/otaris/zertapps/privacychecker/database/App.java
	src/de/otaris/zertapps/privacychecker/database/AppDataSource.java
Removed code duplicates.

Put installed apps into database only on appstart.
Removed it from calling installed apps.

Created list of last updated apps only on appstart.

Show them everytime you return to the homescreen.
Added a textview: "Last updated apps:" for easier understanding of screen items.
Merge branch 'develop' into feature/RecentApps

Conflicts:
	src/de/otaris/zertapps/privacychecker/database/AppDataSource.java
changed home layout and labels
Improved code according to code review notes.

Fixed app crash on galaxy s4. (date -> system.time)

Clean up:
-Deleted unused imports.
-Autoformat.

Updated comments.
added parameter to getLastUpdatedApps to determine the amount of apps to get
Merge remote-tracking branch 'origin/feature/RecentApps' into develop