add >NAME tag, use wire for symbol outline

Using wire for the symbol outline makes it look
more like other schematic symbols (appears red
rather than gray.) Having >NAME that can be changed
is good if there are multiple parts in the schematic.
I think I also moved the symbol so that the origin
is in the center, which makes it easier to drag around,
select, etc.
library has been tested good in actual PCB
Merge pull request #2 from daveho/master

improvements to schematic symbol, tested on PCB