Option to save the inline motion vectors to a file

The option "-x filename" will save the inline motion vector buffer in raw format.
Two example programs where added to host_applications/linux/apps/raspicam/imv_examples/
to show how to post-process these buffers.
Update README.md
Added copyright to the new created c files
Merge pull request #172 from ethanol100/InlineMotionVectors

Inline motion vectors