add texttest fixture for Perl 5 code

texttests/config.gr

@@ -22,6 +22,10 @@ interpreter:java
 # Settings for the C# version
 #executable:${TEXTTEST_CHECKOUT}/GildedRose.exe
 
+# Settings for the Perl version
+#executable:${TEXTTEST_CHECKOUT}/perl/texttest_fixture.pl
+#interpreter:perl
+
 # turn on one of these if you prefer them to notepad or emacs.
 [view_program]
 *:mate

texttests/environment.gr

@@ -1,2 +1,3 @@
 # If your .class files are somewhere else, add the path to the list
 CLASSPATH:${TEXTTEST_CHECKOUT}/Java:${TEXTTEST_CHECKOUT}/Java/bin
+PERL5OPT:-I${TEXTTEST_CHECKOUT}/perl