Added Molex 0480371000 USB A plug (SMT)

- AUTHORS, components/INFO, components/usb_a_plug.lib,
  components/usb_a_plug.dcm: added symbol for USB A plug
- AUTHORS, modules/INFO, modules/usb_a_plug_smt.fpd: added footprint for
  USB A plug
- BOOKSHELF: added Molex 0480371000 USB A plug for SMT
- AUTHORS: corrected type in file extension of modules/xtal-4.fpd (was .fpg)

components/INFO

@@ -28,3 +28,7 @@ S: antenna
 
 # Typical SMT balun configuration
 S: balun
+
+# USB A plug
+S: usb_a_plug
+N: usb_a_plug_smt

components/usb_a_plug.dcm

@@ -0,0 +1,3 @@
+EESchema-DOCLIB  Version 2.0  Date: Mon Oct 25 01:54:18 2010
+#
+#End Doc Library

components/usb_a_plug.lib

@@ -0,0 +1,20 @@
+EESchema-LIBRARY Version 2.3  Date: Mon Oct 25 01:54:18 2010
+#
+# USB_A_PLUG
+#
+DEF USB_A_PLUG CON 0 40 Y Y 1 F N
+F0 "CON" -250 450 60 H V C CNN
+F1 "USB_A_PLUG " 0 -400 60 H V C CNN
+ALIAS MOLEX_0480371000
+DRAW
+S -400 350 350 -300 0 1 0 N
+X VBUS 1 -600 250 200 R 50 50 1 1 P
+X D- 2 -600 100 200 R 50 50 1 1 B
+X D+ 3 -600 -50 200 R 50 50 1 1 B
+X GND 4 -600 -200 200 R 50 50 1 1 P
+X SHELL1 5 550 250 200 L 50 50 1 1 W
+X SHELL2 6 550 -200 200 L 50 50 1 1 W
+ENDDRAW
+ENDDEF
+#
+#End Library