Fixes sending of synthetic data

Fixes how the synthetic data is generated...it is now centered about
zero.  Also generalizes the code so that synthetic data can now be sent
in regular 8-channel 32-bit binary transfer mode, as well as in OpenEEG
P2 binary transfer mode.
Removing saved data files
Increments Log File, Still Weirdness with 16 chan

Now, it creates a new log file every time you hit start/stop.
Unfortunately, there is still weirdness when running this GUI for
16-channels from Daisy-Chained OpenBCI Boards.  Need to fix.
Adds ability to send synthetic 8-chan data
Added newline at end.  No biggie.
Updated Processing Readme.txt
Merge pull request #5 from chipaudette/master

Tweaks to Arduino code and GUI.  Removal of pointless log files.