Adding Changelog file with information on new features and breaking c…

CHANGELOG.md

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+## IgniteUI Components Changelog 
+
+### Features
+- Allow calling component methods via the angular 2 wrapper ([#126](https://github.com/IgniteUI/igniteui-angular2/pull/126))
+- Accessing grid features via the angular 2 wrapper ([#98](https://github.com/IgniteUI/igniteui-angular2/issues/98))
+- Binding to grid feature events. ([#126](https://github.com/IgniteUI/igniteui-angular2/pull/126))
+
+### BREAKING CHANGES
+ - Each igGrid feature now has a separate Directive definition that needs to be imported and added to the module definition if the related feature is to be used in the grid.
+	In previous versions all fetaures were imported as a single Directive definition. Example:
+
+		import { Feature } from "../../src/igniteui.angular2";
+
+	Now each feature has its own specific directive. For example for Paging feature:
+
+		import { Features, IgGridPagingFeature } from "../../src/igniteui.angular2";
+
+
+	Also the syntax for specifying the features has been changed.
+
+	 OLD: 
+
+		<ig-grid ... >
+			<feature [name]="'Paging'" ></feature>
+			<feature [name]="'Sorting'" ></feature>
+			...
+		</ig-grid>
+
+
+	 NEW:
+
+		<ig-grid ... >
+			<features>
+				<paging></paging>
+				<sorting></sorting>
+			</features>
+		</ig-grid>
+
+