.coafile: Add YAMLLintBear

Add YAMLLintBear to .coafile and
fix .travis.yml issues raised by coala

Closes #183

.coafile

@@ -2,3 +2,7 @@
 bears = GitCommitBear
 shortlog_trailing_period = False
 shortlog_regex = ([^:]*|\S+: [A-Z0-9*].*)
+
+[yml]
+bears = YAMLLintBear
+files = *.yml, hooks/*.yml

.travis.yml

@@ -23,10 +23,16 @@ script:
       cd /coala; python3 -m pytest;
       cd /coala-bears;
       rm bears/Constants.py;  # There are no tests covering this module
-      rm bears/c_languages/CSharpLintBear.py tests/c_languages/CSharpLintBearTest.py;
-      rm bears/java/InferBear.py tests/java/InferBearTest.py;
-      rm bears/haskell/GhcModBear.py tests/haskell/GhcModBearTest.py;
-      rm -r bears/verilog tests/verilog/;
+      rm
+      bears/c_languages/CSharpLintBear.py
+      tests/c_languages/CSharpLintBearTest.py
+      bears/java/InferBear.py
+      tests/java/InferBearTest.py
+      bears/haskell/GhcModBear.py
+      tests/haskell/GhcModBearTest.py;
+      rm -r
+      bears/verilog
+      tests/verilog/;
       python3 -m pytest --cov --cov-fail-under=100;
       cd /tmp;
       svn co https://github.com/githubtraining/hellogitworld.git;
@@ -45,7 +51,15 @@ script:
   - docker run --volume=$(pwd)/.ci/sample:/work --workdir=/work coala-docker
   - ls -la ./.ci/sample/.coafile
   - sudo chown $USER ./.ci/sample/.coafile
-  - echo -e "[fail]\nbears = NoCommentsBear\nfile = **.py" >> ./.ci/sample/.coafile
-  - /bin/sh -c "! docker run --volume=$(pwd)/.ci/sample:/work --volume=$(pwd)/.ci/bears:/additional_bears --workdir=/work coala-docker"
+  - >
+    echo -e
+    "[fail]\nbears = NoCommentsBear\nfile = **.py" >> ./.ci/sample/.coafile
+  - >
+    /bin/sh -c "
+      ! docker run
+      --volume=$(pwd)/.ci/sample:/work
+      --volume=$(pwd)/.ci/bears:/additional_bears
+      --workdir=/work coala-docker
+    "
 notifications:
   email: false