lint: add editorconfig and eslint to enforce

.editorconfig

@@ -0,0 +1,11 @@
+# http://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[{*.js,*.json,*.yml}]
+indent_size = 2
+indent_style = space

.eslintignore

@@ -0,0 +1,2 @@
+coverage
+node_modules

.eslintrc.yml

@@ -0,0 +1,6 @@
+root: true
+
+rules:
+  eol-last: error
+  indent: [error, 2, { SwitchCase: 1 }]
+  no-trailing-spaces: error

.travis.yml

@@ -21,6 +21,7 @@ before_install:
 
   # Setup Node.js version-specific dependencies
   - "test $TRAVIS_NODE_VERSION != '0.8' || npm rm --save-dev istanbul"
+  - "test $(echo $TRAVIS_NODE_VERSION | cut -d. -f1) -ge 4 || npm rm --save-dev $(grep -E '\"eslint\\S*\"' package.json | cut -d'\"' -f2)"
 
   # Update Node.js modules
   - "test ! -d node_modules || npm prune"
@@ -29,5 +30,6 @@ script:
   # Run test script, depending on istanbul install
   - "test ! -z $(npm -ps ls istanbul) || npm test"
   - "test   -z $(npm -ps ls istanbul) || npm run-script test-ci"
+  - "test   -z $(npm -ps ls eslint) || npm run-script lint"
 after_script:
   - "test -e ./coverage/lcov.info && npm install coveralls@2 && cat ./coverage/lcov.info | coveralls"

appveyor.yml

@@ -17,6 +17,7 @@ install:
   - ps: Install-Product node $env:nodejs_version
   - npm config set shrinkwrap false
   - if "%nodejs_version%" equ "0.8" npm rm --save-dev istanbul
+  - for /f tokens^=2^ delims^=^" %%m in ('findstr /r /c:"eslint[^ ]" package.json') do call npm rm --save-dev %%m
   - if exist node_modules npm prune
   - if exist node_modules npm rebuild
   - npm install

package.json

@@ -16,6 +16,8 @@
   },
   "devDependencies": {
     "after": "0.8.2",
+    "eslint": "3.19.0",
+    "eslint-plugin-markdown": "1.0.0-beta.6",
     "istanbul": "0.4.5",
     "mocha": "2.5.3",
     "supertest": "1.1.0"
@@ -30,6 +32,7 @@
     "node": ">= 0.8.0"
   },
   "scripts": {
+    "lint": "eslint --plugin markdown --ext js,md .",
     "test": "mocha --reporter spec --bail --check-leaks test/",
     "test-ci": "istanbul cover node_modules/mocha/bin/_mocha --report lcovonly -- --reporter spec --check-leaks test/",
     "test-cov": "istanbul cover node_modules/mocha/bin/_mocha -- --reporter dot --check-leaks test/"