[interpreters] handle booleans, added tests
[interpreters] handle booleans, added tests

perl6/perl6-examples,Quinny/perl6-examples,Quinny/perl6-examples,stmuk/perl6-examples,Quinny/perl6-examples,perl6/perl6-examples,shlomif/perl6-examples,stmuk/perl6-examples,shlomif/perl6-examples,shlomif/perl6-examples,perl6/perl6-examples,perl6/perl6-examples,stmuk/perl6-examples,stmuk/perl6-examples,perl6/perl6-examples,stmuk/perl6-examples,shlomif/perl6-examples,shlomif/perl6-examples,Quinny/perl6-examples,Quinny/perl6-examples