feat(index): add options validation

.editorconfig

@@ -2,7 +2,7 @@ root = true
 
 [*]
 indent_style = space
-indent_size = 4
+indent_size = 2
 end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = true

.gitignore

@@ -1,4 +1,15 @@
-node_modules/
+# OS
+
+.DS_Store
+._*
+
+# NODEJS
+
 npm-debug.log
 yarn-error.log
-build/
+
+dmd
+jest
+coverage
+jsdoc-api
+node_modules

.npmignore

@@ -1,14 +1,24 @@
+# FILES
+
+.travis.yml
 .gitignore
 .npmignore
 .editorconfig
 
-node_modules/
+.travis.yml
+
 npm-debug.log
-yarn-error.log
+
 yarn.lock
+yarn-error.log
 
-build/
-test/
-.travis.yml
 
-gulpfile.js
+# DIRECTORIES
+
+.github
+
+dmd
+test
+coverage
+jsdoc-api
+node_modules

.travis.yml

@@ -1,6 +1,13 @@
+cache:
+  yarn: true
+  directories:
+    - node_modules
+
 language: node_js
-cache: yarn
 node_js:
-  - stable
-  - "6"
-  - "4"
+  - "node"
+  - 6
+  - 4
+
+notifications:
+  email: false

LICENSE

@@ -1,6 +1,6 @@
-The MIT License (MIT)
+License (MIT)
 
-Copyright 2014 Andrey Sitnik <andrey@sitnik.ru>
+Copyright 2017 Andrey Sitnik <andrey@sitnik.ru>
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in

LOADER.md

@@ -0,0 +1,46 @@
+<a name="loader"></a>
+
+## loader(css, map) ⇒ <code>cb</code>
+PostCSS Loader
+
+> Loads && processes CSS with [PostCSS](https://github.com/postcss/postcss)
+
+**Kind**: global function  
+**Returns**: <code>cb</code> - cb      Result  
+**Requires**: <code>module:path</code>, <code>module:loader-utils</code>, <code>module:schema-utils</code>, <code>module:postcss</code>, <code>module:postcss-load-config</code>, <code>module:Error</code>  
+**Version**: 2.0.0  
+**Author**: Andrey Sitnik (@ai) <andrey@sitnik.ru>  
+**License**: MIT  
+
+| Param | Type | Description |
+| --- | --- | --- |
+| css | <code>String</code> | Source |
+| map | <code>Object</code> | Source Map |
+
+
+* [loader(css, map)](#loader) ⇒ <code>cb</code>
+    * [.cb](#loader.cb) : <code>function</code>
+    * [.cb](#loader.cb) : <code>function</code>
+
+<a name="loader.cb"></a>
+
+### loader.cb : <code>function</code>
+**Kind**: static typedef of [<code>loader</code>](#loader)  
+
+| Param | Type | Description |
+| --- | --- | --- |
+| null | <code>Object</code> | Error |
+| result | <code>String</code> | Result (JS Module) |
+| map | <code>Object</code> | Source Map |
+
+<a name="loader.cb"></a>
+
+### loader.cb : <code>function</code>
+**Kind**: static typedef of [<code>loader</code>](#loader)  
+
+| Param | Type | Description |
+| --- | --- | --- |
+| null | <code>Object</code> | Error |
+| css | <code>String</code> | Result (Raw Module) |
+| map | <code>Object</code> | Source Map |
+