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 .pyp suffix and an example source file. closes issue #1
added two more common mathematica suffixes
Merge remote-tracking branch 'upstream/master'
added a sample package
added two notebook samples
Added generated rule for Zephir language
Merge branch 'master' into 1132-local

Conflicts:
	lib/linguist/samples.json
Merge pull request #1289 from github/1132-local

1132 local
Reordering
Merge pull request #1290 from github/1258-local

1258 local
Samples
Merge branch 'master' into 997-local
Samples update
Merge pull request #1291 from github/997-local

997 local
Merge branch 'master' into 1261-local
Samples
Merge pull request #1292 from github/1261-local

1261 local