feat: add Material Theme gutter theme for SublimeLinter

More info here http://www.sublimelinter.com/en/latest/gutter_themes.html

gutter-theme/Material-Theme.gutter-theme

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+{
+    "colorize": true
+}

gutter-theme/README.md

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+# [![Boxy - The Best Sublime Text 3 Theme of 2016][img-name]][theme-downloads]
+
+[![Downloads][img-downloads]][downloads]
+[![Click here to lend your support to: Boxy and make a donation at patreon.com !][img-patreon]][patreon] 
+[![Click here to lend your support to: Boxy and make a donation at flattr.com !][img-flattr]][flattr] 
+[![Click here to lend your support to: Boxy and make a donation at bitcoin.com !][img-bitcoin]][bitcoin]
+
+This [Boxy][theme] addon enables you to change the appearance of the [SublimeLinter][linter].
+
+![Boxy Sublime Linter Theme][img-linter]
+
+Want to learn more? [**See the wiki →**][wiki].
+
+## Get It
+
+### Package Control
+
+The easiest way to install is using [Package Control][pc], where [it][downloads] is listed as `Boxy Theme Addon - Linter Theme`.
+
+1. Open `Command Palette` using menu item `Tools → Command Palette...`
+2. Choose `Package Control: Install Package`
+3. Find `Boxy Theme Addon - Linter Theme` and hit `Enter`
+
+### Manual
+
+You can also install the theme addon manually:
+
+#### Default
+
+1. [Download the .zip][releases]
+2. Unzip and rename the folder to `Boxy Theme Addon - Linter Theme`
+3. Copy the folder into `Packages` directory, which you can find using the menu item `Preferences → Browse Packages...`
+
+#### Preferred
+
+This is the preferred method, because you'll be able to upgrade theme addon package via [Package Control][pc].
+
+1. Go to `Packages` directory, which you can find using the menu item `Preferences → Browse Packages...`
+2. Clone repository here: `git clone https://github.com/oivva/boxy-addon-linter-theme.git "Boxy Theme Addon - Linter Theme"`
+
+## Activation
+
+Activate the SublimeLinter gutter theme by modifying plugin's preferences file, which you can find using the menu item `Preferences → Package Settings → SublimeLinter → Settings - User`.
+
+![SublimeLinter Theme Activation][img-linter-activation]
+
+```js
+"gutter_theme": "Packages/Boxy Theme Addon - Linter Theme/Boxy.gutter-theme",
+```
+
+<!-- Links -->
+
+[theme]: https://github.com/oivva/boxy
+[theme-downloads]: https://packagecontrol.io/packages/Boxy%20Theme
+[releases]: https://github.com/oivva/boxy-addon-linter-theme/releases
+[downloads]: https://packagecontrol.io/packages/Boxy%20Theme%20Addon%20-%20Linter%20Theme
+[patreon]: https://www.patreon.com/oivva "Donate with Patreon"
+[flattr]: https://flattr.com/profile/oivva "Donate with Flattr"
+[bitcoin]: https://www.coinbase.com/oivva "Donate with Bitcoin"
+[wiki]: https://github.com/oivva/boxy/wiki
+[pc]: https://sublime.wbond.net
+[linter]: https://github.com/SublimeLinter/SublimeLinter3
+[pr]: https://github.com/wbond/package_control_channel/pull/5575
+
+<!-- Images -->
+
+[img-name]: https://raw.githubusercontent.com/oivva/boxy-extras/master/assets/readme/name.png
+[img-downloads]: https://img.shields.io/packagecontrol/dt/Boxy%20Theme%20Addon%20-%20Linter%20Theme.svg?maxAge=3600
+[img-patreon]: https://raw.githubusercontent.com/oivva/boxy-extras/master/assets/readme/patreon.png
+[img-flattr]: https://raw.githubusercontent.com/oivva/boxy-extras/master/assets/readme/flattr.png
+[img-bitcoin]: https://raw.githubusercontent.com/oivva/boxy-extras/master/assets/readme/bitcoin.png
+[img-linter]: https://raw.githubusercontent.com/oivva/boxy-extras/master/assets/wiki/gallery/default/tomorrow.png
+[img-linter-activation]: https://raw.githubusercontent.com/oivva/boxy-extras/master/assets/readme/linter-theme-activation.png