Socket control and puredata example fixes.

[stuaxo]

The puredata example and it's bot have diverged a little:

We have helloworld.pd but the variable names match those in bars.bot.

"one", "two", "three".

The ones in helloworld.bot are "red", "green", "blue".

The range in the pd file for the values is different too.

It's not urgent, but these could be made to match, and possibly some rationalisation in this folder.

[rlafuente]

Hey good catch, just updated the var names in d8f6322 and this still works great!

[stuaxo]

Cool ... I think the range of the sliders may not have matched too, not sure why I didn't write that down!

(0-255 in PD, 0-49 in the bot).

Not quite as fatal as having the wrong names.