Add eslint config files and editorconfig

.editorconfig

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+# http://editorconfig.org
+
+# A special property that should be specified at the top of the file outside of
+# any sections. Set to true to stop .editor config file search on current file
+root = true
+
+[*]
+# Indentation style
+# Possible values - tab, space
+indent_style = space
+
+# Indentation size in single-spaced characters
+# Possible values - an integer, tab
+indent_size = 2
+
+# Line ending file format
+# Possible values - lf, crlf, cr
+end_of_line = lf
+
+# File character encoding
+# Possible values - latin1, utf-8, utf-16be, utf-16le
+charset = utf-8
+
+# Denotes whether to trim whitespace at the end of lines
+# Possible values - true, false
+trim_trailing_whitespace = true
+
+# Denotes whether file should end with a newline
+# Possible values - true, false
+insert_final_newline = true

.eslintignore

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+coverage/**
+node_modules/**
+dist/**
+src/index.html

.eslintrc

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+{
+  "parser": "babel-eslint",
+  "extends": [
+    "standard"
+  ],
+  "plugins": [
+    "babel",
+    "promise"
+  ],
+  "env": {
+    "browser": true
+  },
+  "globals": {
+    "__DEV__": false,
+    "__TEST__": false,
+    "__PROD__": false,
+    "__COVERAGE__": false
+  },
+  "rules": {
+    "key-spacing": 0,
+    "jsx-quotes": [
+      2,
+      "prefer-single"
+    ],
+    "max-len": [
+      2,
+      120,
+      2
+    ],
+    "object-curly-spacing": [
+      2,
+      "always"
+    ]
+  }
+}

tests/.eslintrc

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+{
+  "extends" : "../.eslintrc",
+  "env"     : {
+    "mocha" : true
+  },
+  "globals" : {
+    "expect" : false,
+    "should" : false,
+    "sinon"  : false
+  }
+}