add eslint configs and add em to npmignore

.eslintignore

@@ -0,0 +1,2 @@
+node_modules
+lib/migrationTemplate.js

.eslintrc.json

@@ -0,0 +1,35 @@
+{
+	"extends": "airbnb-base",
+	"parserOptions": {
+		"ecmaVersion": 6,
+		"sourceType": "script"
+	},
+	"rules": {
+		"comma-dangle": ["error", "never"],
+		"object-curly-spacing": ["error", "never"],
+		"indent": ["error", "tab"],
+		"no-tabs": 0,
+		"arrow-body-style": ["off"],
+		"arrow-parens": ["error", "always"],
+		"no-underscore-dangle": ["off"],
+		"camelcase": ["error", {
+			"properties": "never"
+		}],
+		"max-len": ["error", {
+			"code": 80,
+			"tabWidth": 1,
+			"ignoreTemplateLiterals": true
+		}],
+		"function-paren-newline": ["error", "consistent"],
+		"class-methods-use-this": [0],
+		"global-require": ["off"],
+		"prefer-destructuring": ["off"],
+		"strict": ["error", "global"],
+		"no-plusplus": ["error", {"allowForLoopAfterthoughts": true}],
+		"no-else-return": ["off"],
+		"no-lonely-if": ["off"],
+		"no-param-reassign": ["off"],
+		"consistent-return": ["off"],
+		"prefer-rest-params": ["off"]
+	}
+}

.npmignore

@@ -5,3 +5,5 @@ coverage/
 .npmrc
 .travis.yml
 .nycrc
+.eslintignore
+.eslintrc.json