11.2.0 development build 12 released

[Daniel Drake]

http://wiki.laptop.org/go/11.2.0

http://build.laptop.org/11.2.0/os12

Notable changes:
gstreamer-plugins-espeak added
XO-1 /boot shrunk a little (disclaimer: I didn't boot-test)
firefox, NetworkManager and telepathy-gabble updates
Calculate updated to v36
Log updated to v24
Maze updated to v8
Pippy updated to v40
Scratch updated to v19
TurtleArt updated to v106

Bugs fixed:
#10716 	changing VT stops camera transmission
#10657 	Including the WeDo plugin in scratch