.travis.yml: Lint files

This duplicates gitmate, catching problems that GitMate misses
in files not included in the commit.

Also tidy yaml files.

Fixes coala#73

.travis.yml

@@ -0,0 +1,11 @@
+language: python
+python: 3.5
+
+install:
+  - pip install setuptools==21 pip==9
+  - pip install 'git+https://github.com/coala/coala#egg=coala'
+  - pip install 'git+https://github.com/coala/coala-bears#egg=coala-bears'
+
+script:
+  - coala --ci
+

data/Language/VisualBasic.yaml

@@ -2,7 +2,8 @@ identifier: Visual Basic
 full_name: Visual Basic
 creation_date: 1991
 wikidata: Q2378
-grammar_file: https://github.com/antlr/grammars-v4/blob/master/vb6/VisualBasic6.g4
+grammar_file:
+  https://github.com/antlr/grammars-v4/blob/master/vb6/VisualBasic6.g4
 aliases:
   - vb
 extensions: