CI checks are failing on doc linter

[luiscruz]

Here's the output from travis:

physalia/power_meters.py:190 in public class `MonsoonHVPMPowerMeter`:
229        D101: Missing docstring in public class
230physalia/utils/android.py:93 in public function `install_apk`:
231        D205: 1 blank line required between summary line and description (found 0)
232physalia/utils/android.py:168 in public function `get_package_from_apk`:
233        D103: Missing docstring in public function
234physalia/utils/android.py:176 in public function `get_instrumentation_for_app`:
235        D103: Missing docstring in public function