Merge pull request #2 from heuripedes/master

Fix audio buffer overflow
Cleanup Get_Frame_Bitmap function - bmpcrop is not used
Indenting cleanups
Cleanup Bitmap_Get_Frame - based on https://code.google.com/p/3doh/source/detail?r=22
Add core option 'High Resolution'
Add HighTResMode = 0 to high resolution disabled options
Do not load content twice
Fix whitespace in libretro.cpp
Clean retro_run and Get_Frame_Bitmap a bit
Allow frame duping