Added docs for loader options plugin (and placeholder for sourcemap) (#534)

* Create loader-options-plugin.md

* Create source-map-dev-tool-plugin.md

* Update loader-options-plugin.md

* Update loader-options-plugin.md

Added myself as contributor

* Update loader-options-plugin.md

* Update source-map-dev-tool-plugin.md

using this as a basis: https://webpack.github.io/docs/list-of-plugins.html#sourcemapdevtoolplugin

* Update loader-options-plugin.md

Author: johnnyreilly

content/plugins/loader-options-plugin.md

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+---
+title: loader-options-plugin
+contributors:
+    - johnnyreilly
+---
+
+?> Review this content
+
+The `loader-options-plugin` is unlike other plugins.  It exists to help people move from webpack 1 to webpack 2.  With webpack 2 the schema for a `webpack.config.js` became stricter; no longer open for extension by other loaders / plugins.  With webpack 2 the intention is that you pass `options` directly to loaders / plugins. i.e. options are **not** global / shared.
+
+However, until a loader has been updated to depend upon options being passed directly to them, the `loader-options-plugin` exists to bridge the gap.  You can configure global / shared loader options with this plugin and all loaders will receive these options.
+
+In the future this plugin may be removed.
+
+```javascript
+new webpack.LoaderOptionsPlugin(options)
+```
+
+* `options.debug` (`boolean`): Whether loaders should be in `debug` mode or not. `debug` will be removed as of webpack 3.
+* `options.minimize` (`boolean`): Where loaders can be switched to minimize mode.
+* `options.options` (`object`): A configuration object that can be used to configure older loaders - this will take the same schema a `webpack.config.js`
+
+* `options.options.context` (`string`): The context that can be used to configure older loaders
+* other options as in a `webpack.config.js`....
+
+## Examples
+
+```javascript
+new webpack.LoaderOptionsPlugin({
+  minimize: true,
+  debug: false,
+  options {
+    context: __dirname
+  }
+})
+```
+

content/plugins/source-map-dev-tool-plugin.md

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+---
+title: source-map-dev-tool-plugin.md
+contributors:
+    - johnnyreilly
+---
+
+?> Review this content
+
+Adds SourceMaps for assets.
+
+```javascript
+new webpack.SourceMapDevToolPlugin(options)
+```
+
+* `options.test` / `options.include` / `options.exclude` (`string|RegExp|Array`): Used to determine which assets should be processed. Each one can be a `RegExp` (asset filename is matched), a `string` (asset filename need to start with this string) or an `Array` of those (any of them need to be matched). `test` defaults to `.js` files if omitted.
+* `options.filename` (`string`): defines the output filename of the SourceMap. If no value is provided the SourceMap is inlined.
+* `options.append` (`string`): is appended to the original asset. Usually the `#sourceMappingURL` comment. `[url]` is replaced with a URL to the SourceMap file. `false` disables the appending.
+* `options.moduleFilenameTemplate` / `options.fallbackModuleFilenameTemplate` (`string`): see `output.devtoolModuleFilenameTemplate`.
+* `options.module` (`boolean`):  (defaults to `true`) When `false` loaders do not generate SourceMaps and the transformed code is used as source instead.
+* `options.columns` (`boolean`):  (defaults to `true`) When `false` column mappings in SourceMaps are ignored and a faster SourceMap implementation is used.
+* `options.lineToLine` (`{test: string|RegExp|Array, include: string|RegExp|Array, exclude: string|RegExp|Array}` matched modules uses simple (faster) line to line source mappings.
+
+## Examples
+
+?> TODO
+