add perl to travis matrix

.travis.yml

@@ -14,6 +14,14 @@ matrix:
       language: python
       python: 2.7
       env: BINDINGS=python
+    - compiler: gcc
+      language: perl
+      perl: 5.14
+      env: BINDINGS=perl
+    - compiler: clang
+      language: perl
+      perl: 5.14
+      env: BINDINGS=perl
 before_install:
   - sudo apt-get update -qq
   - if [ "$BINDINGS" == "python" ]; then sudo apt-get install -qq swig python-dev; fi