added ability to query mysql database

src/databases/Mysql.js

@@ -0,0 +1,27 @@
+var MysqlInterface = require('sync-mysql');
+
+class Mysql {
+  constructor(config) {
+    this.connection = new MysqlInterface(config);
+  }
+
+  exec(query) {
+    this.prepare('run', query, []);
+  }
+
+  prepare (type, query, params) {
+    console.log("prepare (mysql): type: " + type + ", query: " + query + ", params: " + params);
+    if (type === 'get') {
+      return this.connection.query(query, params)[0];
+    } else if (type === 'run') {
+      this.connection.query(query, params);
+    } else if (type === 'all') {
+      return this.connection.query(query, params);
+    } else {
+      console.log('returning undefined...')
+      return undefined;
+    }
+  }
+}
+
+module.exports = Mysql;