Add bindings for Home and End keys

See #21

cmd/micro/help.go

@@ -33,6 +33,9 @@ Ctrl-d:   Half page down
 PageUp:   Page up
 PageDown: Page down
 
+Home:     Go to beginning
+End:      Go to end
+
 Ctrl-e:   Execute a command
 
 Possible commands:

cmd/micro/view.go

@@ -485,6 +485,12 @@ func (v *View) HandleEvent(event tcell.Event) {
 			v.OpenFile()
 			// Rehighlight the entire buffer
 			v.UpdateLines(v.topline, v.topline+v.height)
+		case tcell.KeyHome:
+			v.topline = 0
+			relocate = false
+		case tcell.KeyEnd:
+			v.topline = len(v.buf.lines) - 1 - v.height
+			relocate = false
 		case tcell.KeyPgUp:
 			v.PageUp()
 			relocate = false