Added .travis.yml and have Build.PL exit with non-zero in case of failure

.travis.yml

@@ -0,0 +1,7 @@
+script: perl ./Build.PL
+perl:
+  - "5.14"
+  - "5.12"
+branches:
+  only:
+    - master

Build.PL

@@ -131,12 +131,14 @@ EOF
 if ($missing_prereqs) {
     exit 1;
 } else {
+    my $res = 0;
     if (eval "use App::Prove; 1") {
-        App::Prove->new->run;
+        $res = App::Prove->new->run ? 0 : 1;
     }
     if (!$gui) {
         print "If you also want to use the GUI you can now run `perl Build.PL --gui` to install the required modules.\n";
     }
+    exit $res;
 }
 
 __END__