Use like this:
	  make px4fmu-v2_default uorb_graph

* NuttX cmake

* px4_macros:Pass the stringified predicate as second arg to static assert

   CC_ASSERT mapes to the c++ static_assert or provides the same
   funtionality for c via the other macros. The c++ static assert
   takes 2 argumants the prdicate and a message. This fixes the
   lacking second argument.

* Updated nuttx and apps submodule to upstream nuttx 7.21+==master

   This is the latest uptake of upstream nuttx and apps.

* ROMFS generate with xxd instead of objcopy

* delete nuttx-patches

* NuttX update submodules to latest px4_nuttx-master

* fix nuttx apps and board dependency

* docker_run update to latest container 2017-08-29

* cmake ROMFS portable sed usage

* NuttX update submodules to latest px4_nuttx-master

each CMakeFile that generates parameters should add its path to the msg_include_path
which will then be handled in the px_generate_uorb_topic_files.py

 - pulls more of the travis-ci s3 deploy into the repo so we can potentially migrate to another CI system
 - fixed the sizes output and added verbose compiler version to cmake (#6322)
 - fixed filenames for firmware uploaded to s3 (was broken by the changes yesterday)
 - fixed some broken git version display in cmake
 - Makefile organization
 - simplified .travis.yml
 - added a print to know which config the nuttx patch was being applied to
 - docker_run.sh now respects PX4_DOCKER_REPO for setting the docker image, but defaults to the good production nuttx image

- the only difference really is, that scope (the configuration.cmake) is already passed
  to px_process_params via the argument --scope. The Paths in --scope are evaluated w.r.t
  the path to src provided via the -s /--src-path argument.
- if no --scope is proveided. the Old scheme by simply walking the full --src-path directory
  is applied

Since the git hashes were being generate by cmake it would only be
generated if the header file was not present. Simple test:

    $ make aerofc-v1_default
    $ touch a
    $ git add a
    $ git commit -m tmp
    $ make aerofc-v1_default

The file build_aerofc-v1_default/build_git_version.h should have the new
hashes and the correspondent .c/c.pp files should be rebuilt, but they
aren't.  The end result is that checking the version with "ver git" in
the nsh console will point to the wrong commit.

This moves the generation of the header to a separate tool and enforces
the command to be executed every time.

If the Python versions are specified, this breaks the build on Ubuntu systems
where Python3 is also installed but the extensions such as python-empy
are not installed. One could, of course, install python3-empy to fix
this but that's not in the instructions or error messages and therefore
not straightforward.

It is therefore probably better to just use the system default which
ends up being 2.7 on Ubuntu.

This brings support for Distros that use Python3 by default such as
Arch Linux.