* Changed soil moisture driver to not run on import.
* Changed soil moisture driver to not run on import.

Changed
=======

* Wrapped the contents of soil_moisture_driver into a main function, which
  is run when soil_moisture_driver.py is run as a script. This prevents the
  code from running when the soil_moisture_driver is imported. To run from
  the Python command line:
    >>> import landlab.components.soil_moisture_driver as smd
    >>> smd.main()



SiccarPoint/landlab,landlab/landlab,cmshobe/landlab,ManuSchmi88/landlab,cmshobe/landlab,RondaStrauch/landlab,SiccarPoint/landlab,Carralex/landlab,csherwood-usgs/landlab,ManuSchmi88/landlab,decvalts/landlab,laijingtao/landlab,Carralex/landlab,ManuSchmi88/landlab,laijingtao/landlab,decvalts/landlab,landlab/landlab,landlab/landlab,RondaStrauch/landlab,amandersillinois/landlab,amandersillinois/landlab,Carralex/landlab,RondaStrauch/landlab,cmshobe/landlab,csherwood-usgs/landlab