base/Temperature: no superfluous includes

decrease compilation time

Signed-off-by: Martin Zenzes <martin.zenzes@dfki.de>
base/Temperature: "std:abs" instead of fabs

templated version prevents unwanted type-conversions

Signed-off-by: Martin Zenzes <martin.zenzes@dfki.de>
Merge pull request #12 from marvin2k/fix_base_temperature

Fix base temperature