check for duplicate keys (ros#14447)

* check for duplicate keys

* remove duplicate key used for testing

.travis.yml

@@ -9,10 +9,13 @@ install:
  - easy_install -U pip
  - pip install PyYAML argparse
  - pip install catkin_pkg ros_buildfarm rosdistro nose coverage
+ - pip install yamllint
  - pip install unidiff
 
 # command to run tests
-script: nosetests -s
+script:
+ - nosetests -s
+ - yamllint */
 
 notifications:
  email:

.yamllint

@@ -0,0 +1,42 @@
+rules:
+ # braces:
+ # min-spaces-inside: 0
+ # max-spaces-inside: 0
+ # brackets:
+ # min-spaces-inside: 0
+ # max-spaces-inside: 0
+ # colons:
+ # max-spaces-before: 0
+ # max-spaces-after: 1
+ # commas:
+ # max-spaces-before: 0
+ # min-spaces-after: 1
+ # max-spaces-after: 1
+ # comments:
+ # level: warning
+ # require-starting-space: yes
+ # min-spaces-from-content: 2
+ # comments-indentation:
+ # level: warning
+ # document-end: disable
+ # document-start:
+ # level: warning
+ # present: false
+ # empty-lines:
+ # max: 2
+ # max-start: 0
+ # max-end: 0
+ # hyphens:
+ # max-spaces-after: 1
+ # indentation:
+ # spaces: consistent
+ # indent-sequences: yes
+ # check-multi-line-strings: no
+ key-duplicates: enable
+ # line-length:
+ # max: 999
+ # allow-non-breakable-words: yes
+ # new-line-at-end-of-file: enable
+ # new-lines:
+ # type: unix
+ # trailing-spaces: enable