Updated Gadgeteer Socket Soldering tutorial, and sourcing info

[godefroi]

(When I worked at a music store in high school, we sold chunks of rosin to violinists to rub on their horse hair bows. Same stuff?)

Yup, same stuff. Comes from pine trees.

[ianlee74]

Same stuff?

According to this, I believe it is.

http://dangerousprototypes.com/docs/Flux,_flux,_flux

[Mike_Bagnaschi]

I got those radio kits when I was a kid