Added Linux build artifacts to ignore list

Build/.gitignore

@@ -13,3 +13,26 @@ Release-iphonesimulator
 DerivedData
 libRocket.build/Debug/RocketCore.build
 libRocket.build
+
+Makefile
+_rocketcontrols.so
+_rocketcore.so
+customlog
+datagrid
+datagrid_tree
+drag
+invaders
+libRocketCore.so
+libRocketCore.so.*
+libRocketCore.a
+libRocketControls.so
+libRocketControls.so.*
+libRocketControls.a
+libRocketDebugger.so
+libRocketDebugger.so.*
+libRocketDebugger.a
+libshell.a
+loaddocument
+template
+treeview
+tutorial_drag