Add Mapbox Provider (#876)

* Add Mapbox Provider

* Fixing code styling

* Add dummy Mapbox API key to phpunit

Author: fedeisas

.gitattributes

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+.gitattributes   export-ignore
+.travis.yml      export-ignore
+phpunit.xml.dist export-ignore
+Tests/           export-ignore

.gitignore

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+vendor/
+composer.lock
+phpunit.xml
+.idea

.travis.yml

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+language: php
+sudo: false
+
+php: 7.0
+
+
+install:
+  - composer update --prefer-stable --prefer-dist
+
+script:
+    - composer test-ci
+
+after_success:
+    - wget https://scrutinizer-ci.com/ocular.phar
+    - php ocular.phar code-coverage:upload --format=php-clover build/coverage.xml
+

CHANGELOG.md

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+# Change Log
+
+The change log describes what is "Added", "Removed", "Changed" or "Fixed" between each release.
+
+## 1.0.0
+
+First release of this library. 

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2011 — Fede Isas <[email protected]>
+
+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 the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.