Making flycheck happy

- punctiation
- mention arguments in documentation
- docstring comes before (interactive)
Merge branch 'master' of github.com:mrvdb/twister.el

* 'master' of github.com:mrvdb/twister.el:
  Add info on interactive use
Add 'getfollowing' implementation

- get rid of the tw-* vs twister-* distinction
- update docstrings with references
- implement base function for getfollowing