MUS-94: Added a Piano View based on xml Files.

Started to make a dynamic Piano View. Button Positioning
MUS-94: Added NoteSheetView, Refactored PianoView

Creating the basic layout with Fragments and XML files.
Merge commit
MUS-94: NoteSheetView, Refactoring

fixing NoteSheetView, renamed Key and Insrument classes, fixed
TickThread
MUS-94: Rename classes

Instument -> MusicalInstrument
Key -> MusicalKey
MUS-86: Export as midi

created menu, added first save function (saving midi to:
sdcard/musicdroid/test.midi)
Revert "MUS-86: Export as midi"

This reverts commit cd50cc471b5ed56f357d3a5361930fa141424f6f.
MUS-86: Refactoring

Added AbstractTickThread, Moved Project class, removed name attribute of
Project, refactored Converter classes around this change
MUS-94: Note Tests

Started adding old note tests. They run, but there is still some
refactoring to do.
MUS-94: Note Tests Round 2

Refactoring
MUS-94: Note Tests Round 3
MUS-94: Note Tests Round 4

Refactoring + MIDI Tests (work in progress)
MUS-94: Note Tests Round 5

added symbol tests
MUS-94: Midi packaged moved

Moved midi package into note package. Deleted the Midi Test Case (with
todo mark to add it again soon)
MUS-94: Midi package moved

deleted files because of move
MUS-94: TestCases for PianoViewFragment
MUS-94: TestCases for Piano

Refactoring / Code Review with Andrej of Test Cases (PianoActivityTest
and PianoKeyTest)
MUS-94: TestCases for Piano

Changed a single parameter in the PianoKeyTest class. See Diff, its
super easy
MUS-94: InstrumentActivity

Fixed default values in InstrumentActivity. Now the MusicalKey and the
MusicalInstrument gets set by the child classes (like the PianoActivity)
MUS-94: deleting classes

deleted all classes which were not used in this branch so that we can
keep the code nice