git helper: added support for manunal tests

Signed-off-by: Milosz Wasilewski <milosz.wasilewski@linaro.org>
testrunner: added Bug class

Signed-off-by: Milosz Wasilewski <milosz.wasilewski@linaro.org>
fixes in the data digging scripts

Signed-off-by: Milosz Wasilewski <milosz.wasilewski@linaro.org>
Merge branch 'master' of https://github.com/mwasilew/testmanager