Updated the setting of screen properties to use Screen API calls
rather than using a strm dictionary object with a call to
mmr_output_parameters(). Also allow screen_create_window_group()
to generate a unique group name rather than specifying one.
Change a few variable names; used constants for some values for
better readability; updated to reflect BB10 Z10 rather than
PlayBook; added portrait mode background picture for the app.

See JI:668242
Updated variable names, replaced some values with constants for
readability; realigned to Z10 rather than PlayBook; added new
background picture better suited to BB10.

JI:668292
Updated variable names, used variables for some constant values;
switched to Z10 focus rather than PlayBook; added Z10 portrait
appropriate background picture.

See JI:668292
Merge branch 'helloworlddisplay' of https://github.com/Combinatoric/NDK-Samples into helloworlddisplay
Merge pull request #88 from Combinatoric/helloworlddisplay

Helloworlddisplay