Creates file export buttons
@param hashKey {String}
@param dataObject {String}
@param myContent {String}
@param myClass {String}
@param bootstrapSettings {Object}
@returns Element
function(hashKey, dataObject, myContent, myClass, bootstrapSettings) {
      var exportButton = document.createElement("button");
      exportButton.setAttribute("type", "button");
      exportButton.setAttribute(this.storageKey, hashKey);
      exportButton.className = bootstrapSettings.bootstrapClass + bootstrapSettings.bootstrapTheme + myClass;
      exportButton.textContent = myContent;
      return exportButton;
    }