Camera focus is now drawn over the camera preview.
https://github.com/adlebzelaznog/colometer/issues/7 implemented.
Merge pull request #12 from adlebzelaznog/feature/camera_focus

Camera focus is now drawn over the camera preview.
Added principal screen activity lifecycle events logging.
Used color model is displayed, as https://github.com/adlebzelaznog/colometer/issues/13 requires.
Merge pull request #14 from adlebzelaznog/feature/display_used_color_model

Feature/display used color model
Principal screen now takes user preferences from SharedPreferences file.
Target color format is now gotten from user preferences.
minor refactoring (deleted unused fields and imports).
Restored camera focus drawing.
Camera focus drawing was removed by mistake on commit 44a305613f8c7714eb1b74595d320d52e467eac7 .
NV21 color model added.
Settings view now load and write user preferences from sharedPreferences.
Color model converter now support NV21.

Since NV21 is the default format provided by android camera the new method only parses byte[] to int[].
Added new NV21 color format to the ColorFormats enum.
Camera focus radius can now be changed into settings view
focus radius now changes when returning to principal screen.
Added color model selection view.
For some reason color mode changes doesn't remain when returning to principal screen.
Color model can now be changed on settings view.
Merge pull request #16 from adlebzelaznog/feature/options_menu

Feature/options menu