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 F# sample.  Add Forth extension .fs.
Update samples.json.