Added Nit to supported languages.

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>
Added examples for Nit to samples.

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>
Updated samples.json.

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>
Merge branch 'master' into 1320-local

Conflicts:
	lib/linguist/samples.json
Merge pull request #1341 from github/1320-local

1320 local
Add a multitude of Forth file extensions.
Yes, these are all in use.
Add Groff sample.
Update samples.json.
Make test_pedantic accept quotes around extensions.