- `Context` now provides a copy of the parsed cli options so that they
can be used by plugins.
- Modified `Dispatcher` to pass parsed cli options to `Context`
Resolves#249
Prior to this patch, Dotbot was relying on running with the base
directory being the current working directory. In practice, it was
relying on the install shim to set up this context. It makes more sense
sense to actually execute `chdir()` within Dotbot itself, rather than
relying on the install shim to do so.