Add ESLint configuration

.eslintignore

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+# Midas Server. Copyright Kitware SAS. Licensed under the Apache License 2.0.
+
+**/*.min.js
+**/jqplot*.js
+**/jquery*.js
+bower_components/
+library/SwaggerUI/
+modules/{pvw,visualize}/public/js/jquery/colorpicker.js
+modules/statistics/public/js/googlemaps/*.js
+modules/visualize/public/js/{paraview,webgl}/*.js
+node_modules/
+vendor/

.eslintrc

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+#=============================================================================
+# Midas Server
+# Copyright Kitware SAS, 26 rue Louis Guérin, 69100 Villeurbanne, France.
+# All rights reserved.
+# For more information visit http://www.kitware.com/.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0.txt
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#=============================================================================
+
+---
+rules:
+  indent:
+    - 2
+    - 4
+  quotes:
+    - 2
+    - single
+  linebreak-style:
+    - 2
+    - unix
+  semi:
+    - 2
+    - always
+
+  no-unused-vars:
+    - 2
+    - argsIgnorePattern: ^_
+
+env:
+  browser: true
+  jquery: true
+
+extends: 'eslint:recommended'