Subject Object interaction

Implemented possibility for Subject to move to Objects and interact with them.
Merge pull request #5 from oObqpdOo/master

Subject Object interaction (pseudocode)
rename Object to Item

because of possible future namespace problems, rename the Object Class to Item.
clean up in GraphicalOutput + enable HW-acceleration

adds some version information, cleans up the code (unused members), adds comments on how to deal with things when more code will exist..
also enables hardware acceleration in the Android manifest
Sound

added Sound to Subject - needs to be improved still
Exit App

App is killed by pressing the "Back" - Key - still needs to be reworked - read: Life cycle of Android App
Merge pull request #6 from oObqpdOo/master

Fix non-working sound effects.
SoundManger

Delete SoundManager - replaced by Mediaplayer
Merge pull request #7 from oObqpdOo/master

Remove SoundManger - replace with new MediaPlayer
add GlobalInformation class

this adds a "static" class for global access to important properties, such as screen size, current room etc
cleans up the graphicalOutput, making it ready for performance improvements
remove initialized-flag from the subject

as the subject can now properly init itself, the isInit-flag and its methods can go away.
SoundManger

fixed volume control of the App
Merge pull request #10 from oObqpdOo/master

SoundManger - fix volume control
remove unnecessary layer of abstraction

abstract class SubjectAction was removed due to it being unnecessary. movements from KI are always followed by actions on the destination object.
make RoomList and Subject publically available, rename MyActivity

for the HouseActivity we will need to access the current subject room and the list of rooms in the house. in order to avoid passing things between activities, we just make global things available globally.
KI unf Need

Klasse KI erstellt und implementiert. Hat alle Tests erfolgreich bestanden.
Need nur zum kompilieren geschrieben. Wird von Mathias noch ersetzt (siehe Kommentare in Need.java).