Implement FindChildElements for IElement +semver: feature (#72)

* Implement FindChildElements in IElementsFactory, resolves #67.

* Fixes #71 (dotted xpath locator split issue).

* Fix GenerateXPathLocator method for ByChained type of locator.

* Implement XPath extraction logic

Aquality.Selenium.Core/src/Aquality.Selenium.Core/Elements/Element.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using Aquality.Selenium.Core.Applications;
 using Aquality.Selenium.Core.Configurations;
 using Aquality.Selenium.Core.Elements.Interfaces;
@@ -76,6 +77,11 @@ public T FindChildElement<T>(By childLocator, string name = null, ElementSupplie
             return Factory.FindChildElement(this, childLocator, name, supplier, state);
         }
 
+        public IList<T> FindChildElements<T>(By childLocator, string name = null, ElementSupplier<T> supplier = null, ElementsCount expectedCount = ElementsCount.Any, ElementState state = ElementState.Displayed) where T : IElement
+        {
+            return Factory.FindChildElements(this, childLocator, name, supplier, expectedCount, state);
+        }
+
         public string GetAttribute(string attr)
         {
             LogElementAction("loc.el.getattr", attr);