Added Country Map : New Visualization tools (#2708)

* feat(visualization): Create new visualization's tools that display country with geojson file. Currently only  france and Spain are loaded

* refacto(visualization): fix issues created by codeclimate

* refacto(visualization): fix issues created by travis for mysql databases

* refacto(visualization): fix issues created by codeclimate

* refacto(visualization): fix issues created by codeclimate

* refacto(visualization): fix issues created by codeclimate

* refacto(visualization): fix issues created by codeclimate

* fix(visualization): fix issues

* doc(visualization): Init visualization documentation

* doc(visualization): init visualization documentation for country

* fix(visualization): implement iso 3166-2 for id of country

* fix(visualization): implement iso 3166-2 for id of country

* doc(visualization): init visualization documentation for country

* fix(visualization): implement iso 3166-2 for id of country

* feat(country_map): add ukraine map in component

* fix(visualization): Test dont working and add color based on metrics

* refacto(visualization): fix issues for es6 and color component

superset/assets/visualizations/main.js

@@ -27,6 +27,7 @@ const vizMap = {
   sunburst: require('./sunburst.js'),
   table: require('./table.js'),
   treemap: require('./treemap.js'),
+  country_map: require('./country_map.js'),
   word_cloud: require('./word_cloud.js'),
   world_map: require('./world_map.js'),
   dual_line: require('./nvd3_vis.js'),