Merge pull request #258 from lisawim/SE_new

pySDC/implementations/problem_classes/Battery.py

.../implementations/problem_classes/Battery_2Condensators.py

pySDC/projects/PinTSimE/battery_2capacitors_model.py

pySDC/projects/PinTSimE/battery_2condensators_model.py

pySDC/projects/PinTSimE/battery_model.py

pySDC/projects/PinTSimE/estimation_check.py

pySDC/projects/PinTSimE/estimation_check_2capacitors.py

pySDC/projects/PinTSimE/switch_estimator.py

..._projects/test_pintsime/test_battery_2capacitors_model.py

...ests/test_projects/test_pintsime/test_estimation_check.py

...ojects/test_pintsime/test_estimation_check_2capacitors.py