Update to travis for debug

Author: flippmoke

.travis.yml

@@ -43,6 +43,9 @@ before_install:
 
 install:
  - python setup.py install --prefix $(pwd)/mason_packages/.link
+ - if [[ $(uname -s) == 'Linux' ]]; then
+    readelf -d $(pwd)/mason_packages/.link/lib/libmapnik.so
+   fi;
 
 before_script:
  - python test/run_tests.py -q