Revert "Revert "Moritz Huebner: Removed default parameters for sampling...

Revert "Revert "Moritz Huebner: Removed default parameters for sampling frequency and time duration in the waveform generator""

This reverts commit 91e90f0d.
3 jobs for master in 18 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #77403
exitcode-jessie

00:00:18

failed #77401
exitcode-jessie

00:00:20

 
  Deploy
skipped #77402
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Name Stage Failure
failed
exitcode-jessie Test
    (npversion, min_versions['numpy']))

ImportError: Numpy version is 1.8.2. Requires >= 1.9

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Cleaning up...
Command python setup.py egg_info failed with error code 1 in /tmp/pip-build-NXquiK/statsmodels
Storing debug log for failure in /root/.pip/pip.log
ERROR: Job failed: exit code 1