Merge tag '0.1.7' into develop

Version 0.1.7
Merge tag '0.1.8' into develop

Version 0.1.8
feat: PathMixin
Merge tag '0.1.9' into develop

Version 0.1.9
chore: PathMixin methods assume that instance has attribute 'tvd_dir'
refactor: ResourceMixin provides resource-related methods
docker: pre-install plugins
chore: update LICENSE
refactor: major package refactoring

- clear separation between tvd.plugin, tvd.core and tvd.rip
- "import tvd" will now load all available plugins.
feat: add "data" argument to Plugin.iter_resources
doc: copyright
fix: cyclic imports bug
refactor: tvd.create uses docopt
Merge branch 'feature/structure' into develop
doc: update
feat: CHANGELOG
Merge branch 'release/0.2'