Add misclassified Prolog samples

These two files are incorrectly classified as Perl.  They should be
classified as Prolog.  There are many distinctive tokens in each file
which clearly differentiate between Perl and Prolog.
Added GameMaker support
Merge branch 'add_gamemaker_support' of https://github.com/RyanNielson/linguist into mergepullrequests

Conflicts:
	lib/linguist/samples.json
Merge branch 'prolog-samples' of https://github.com/mndrix/linguist into mergepullrequests