This is the start of the series of commits focussed on cleaning up the exmaples/ directory. This commit moves mraa-gpio, mraa-i2c, mraa-uart files out of examples directory into new tools directory. Moved files are the good cadidates to be treated as tools instead of examples. Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>