Add .cgi as an extension for Python and Bash
Scripty Prolog
Merge pull request #1508 from github/prolog-script

Scripty Prolog
Merge pull request #1506 from pchaigno/cgi-scripts

Add .cgi as an extension for Python and Bash
Samples
3.1.5
Merge pull request #1509 from github/cut-release-v3.1.5

3.1.5
Add FORTRAN samples.
Add Forth extensions .f and .for; add heuristics for Forth and FORTRAN.
Update samples.json.