Switch to new vendor directory layout

Fixes #113

Signed-off-by: Marcos Lilljedahl <marcosnils@gmail.com>

vendor/github.com/Azure/go-ansiterm/osc_string_state.go

@@ -0,0 +1,31 @@
+package ansiterm
+
+type OscStringState struct {
+	BaseState
+}
+
+func (oscState OscStringState) Handle(b byte) (s State, e error) {
+	logger.Infof("OscString::Handle %#x", b)
+	nextState, err := oscState.BaseState.Handle(b)
+	if nextState != nil || err != nil {
+		return nextState, err
+	}
+
+	switch {
+	case isOscStringTerminator(b):
+		return oscState.parser.Ground, nil
+	}
+
+	return oscState, nil
+}
+
+// See below for OSC string terminators for linux
+// http://man7.org/linux/man-pages/man4/console_codes.4.html
+func isOscStringTerminator(b byte) bool {
+
+	if b == ANSI_BEL || b == 0x5C {
+		return true
+	}
+
+	return false
+}