MikeHeiber/Excimontec: Interfacial Energy Shift, Site Energy Import, and Steady State Transport Test Update

Excimontec v1.0 has left the beta stage and now has a stable feature set and public API. Major updates in this release: Added new interfacial energy shift model for modifying site energies in mixed phases and at interfaces Added ability to import custom site energies from a text file Added new steady state charge transport simulation feature Added Changelog for documenting all changes to the repository Significantly increased unit test coverage to help verify functionality and accuracy of the code For a detailed listing of all changes, see the Changelog. This release was developed under the financial assistance award 70NANB14H012 from U.S. Department of Commerce, National Institute of Standards and Technology as part of the Center for Hierarchical Materials Design (CHiMaD)