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 FORTRAN samples.
Add Forth extensions .f and .for; add heuristics for Forth and FORTRAN.
Update samples.json.