Serial: Update to latest upstream (fixes potential port handle leak)
Merge pull request #2361 from gohai/serial-new

Serial: Update to latest upstream (fixes potential port handle leak)
CA example quick fix
misc changes/notes
fixes #2375
fixes #2345, and also a bug in the coordinates passed to drawTexture()
in the Texture class.
Merge remote-tracking branch 'official/master' into merging