bumping version to 0.2.19.dev for development
adding new and updated image renderings
handle abbreviated forms of bundle_packing parameter and update docstring examples
more minor updates to docstrings
removing unused example rendering
adding and updating example figure renderings
updating examples in docstrings
adding new figure rendering
removing old figure rendering
updating example docstring
adding new figure rendering
starting new package for data analysis
renaming vacancy_generator module to defect_generator
moving graphene and nanotube vacancy generator classes to own modules
updating imports
removing unused _funcs module
moving code from _funcs module into separate modules
adding new modules to analysis package
adding new modules for feature development and updating imports in __init__
adding new subpackage to hold json encoded structure data