i2c-tools: udated to version 3.1.1

3.1.0 is dated 2011-12-04.
3.1.1 is from 2014-02-20 and has quite a few enhancements.

Signed-off-by: oli vogt <oli.vogt.pub01@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>