camera.py sizes and baudrates added.

this module includes code to select the sizes (3 choices) and
baudrates (5 choices) between the ones that the DSP allows.
The code still needs some tunning regarding the timing issues (
the delays can be shortened if the baurate is increased).
camera.py: issue setting different baudrate than the default.

when using a baudrate different than the default one (38400) the
images gets frozen (issue with the buffers) and the size cannot be
selected properly.

With the default baudrate everything seems to be functional.
camera.py: transferImage added.

Transmits the image through scp.