Added uORB tiny pub/sub for usage without struct on stack.
Merge branch 'master' of git://github.com/PX4/Firmware into uORB_tiny
ignore build folder
wrapped subscriber
improve subsciber api
create list of subscribers
Merge remote-tracking branch 'upstream/master' into dev_ros
define default queue size
px4 wrapper for ros publisher
ros wrapper: small reordering
Merge remote-tracking branch 'upstream/pr/1040' into uorbtinymerge

Conflicts:
	mavlink/include/mavlink/v1.0
	src/modules/mc_att_control/mc_att_control_main.cpp
WIP, towards more px4 compatibility, first macros
fix order of arguments (merge fix)
Merge remote-tracking branch 'upstream/uorbtinymerge' into dev_ros
wip, working on the nuttx wrapper
reenable task flag
fix ros compile errors
move spin functions to nodehandle
NuttX submodule: header changes
WIP, c++11 style callbacks for px4