WEB-1471:CHANGE: CamelCase on class name and improve docs

lib/index.js

@@ -2,9 +2,9 @@ import provide from './provide';
 
 /**
  * Class for the `ga-task-manager` analytics.js plugin.
- * @implements {GATaskManagerPublicInterface}
+ * @implements {GaTaskManagerPublicInterface}
  */
-class gaTaskManager {
+class GaTaskManager {
   /**
    * Registers declarative event tracking.
    * @param {!Tracker} tracker Passed internally by analytics.js
@@ -83,7 +83,7 @@ class gaTaskManager {
    * If a function is given, it will be executed every time at the moment of task execution.
    * If a number is given, it will be cast automatically to a string by calling Number.toString() method.
    * Observe size limit for the string value https://developers.google.com/analytics/devguides/collection/analyticsjs/field-reference#customs
-   * @param {string} gaTaskName The name of the GA Task on which to set the Custom Dimension.
+   * @param {string} gaTaskName The name of the GA Task on which to set the Custom Dimension. Defaults to 'customTask'.
    */
   setCustomDimension(index, value, gaTaskName = 'customTask') {
     const userTaskName = 'customDimension' + index;
@@ -128,4 +128,4 @@ class gaTaskManager {
   }
 }
 
-provide('gaTaskManager', gaTaskManager);
+provide('GaTaskManager', GaTaskManager);