v0.2.0

This is the second release of the RadiativeTransfer.jl package. This version of the package contains one new module: PhaseFunction.jl. This module enables scattering phase-function calculation of atmospheric aerosols with different size distributions, incident wavelengths, and refractive indices. It can perform the calculation using either the Siewert NAI-2 or Domke PCW methods (See Suniti Sanghavi, 2014).