Added JEI integration (#2436).

src/main/java/appeng/integration/abstraction/IJEI.java

@@ -0,0 +1,15 @@
+package appeng.integration.abstraction;
+
+
+/**
+ * Abstracts access to the JEI API functionality.
+ */
+public interface IJEI
+{
+
+	boolean isEnabled();
+
+	String getSearchText();
+
+	void setSearchText( String searchText );
+}