Update README.md to reflect roswtf's needs.

meta-ros is supposed to be used for building a custom distribution
which isn't derived from any of the OSs known to the rospkg.os_detect
module.

Signed-off-by: Dmitry Rozhkov <dmitry.rozhkov@linux.intel.com>

roswtf reports that

ROS_ROOT is invalid: ROS_ROOT [/opt/ros/indigo] must end in directory named 'ros'

Update README.md to change ROS_ROOT value to '/opt/ros'.

Signed-off-by: Dmitry Rozhkov <dmitry.rozhkov@linux.intel.com>

adjusting to recent updates in ROS indigo distribution

This commit removes the patch that has been accepted upstream
and has been included in the version 1.5.45.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@oss.bmw-carit.de>

README.md: point out OpenEmbedded category on discourse.ros.org

patch all ROS packages to build with gcc6 (resolves #392)

python-imaging: removing recipe maintained in meta-python

Due to the update to 1.8.0, the upstream-accepted patch is not
anymore needed to be applied.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@oss.bmw-carit.de>

Compiling libflann 1.8.4 with gcc6 fails with:

```
| /home/lukas/work/repositories/openembedded.org/openembedded-core/build/tmp-glibc/work/i586-oe-linux/libflann/1.8.4-r0/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:666:39: error: call of overloaded 'abs(flann::KDTreeIndex<flann::KL_Divergence<double> >::ElementType)' is ambiguous
|                  ElementType span = abs(point[i]-leaf_point[i]);
|                                     ~~~^~~~~~~~~~~~~~~~~~~~~~~~
```

This issue has been already addressed in the latest version 1.9.1,
hence the commit simply updates the recipe to the version 1.9.1,
which is available on github.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@oss.bmw-carit.de>

On 2016-06-08, the commit 000095f3 [1, 2] added the python-imaging
recipe that was dropped in OpenEmbedded Core in commit b03ebfaee [3]
on 2016-06-02.

Coincidentally, python-imaging was also added in meta-python
on 2016-06-08 [4], and it has been further maintained in that layer [5].

Instead of continuing to maintain the recipe in meta-ros, we decide to
rely on the recipe provided in meta-python, and hence, remove the
recipe in meta-ros.

[1] https://github.com/bmwcarit/meta-ros/commit/000095f3f4d5f6d15ffab11ebe4d33ad90541967
[2] https://github.com/bmwcarit/meta-ros/issues/393
[3] http://cgit.openembedded.org/openembedded-core/commit/meta/recipes-devtools/python?id=b03ebfaee278eb98b4bd0e11a682ac0cda192086
[4] http://cgit.openembedded.org/meta-openembedded/commit/meta-python/recipes-devtools/python/python-imaging_1.1.7.bb?id=56a4d21706e0219bbe488c2bd1450247f4f89d0d
[5] http://cgit.openembedded.org/meta-openembedded/tree/meta-python/recipes-devtools/python/python-imaging_1.1.7.bb



Signed-off-by: Lukas Bulwahn <lukas.bulwahn@oss.bmw-carit.de>

create-ros-recipe.py: add script to generate ROS recipes

create-ros-recipe.py: add script to generate ROS recipe from repository, package name and package version

Adjusting to updates of the ROS indigo distribution

image-publisher: providing initial recipe

Recent recipe updates for the indigo distribution

diagnostics: updating to 1.8.10 and adjusting dependencies

In 2014, the update of the diagnostics recipes from 1.8.3 to 1.8.4
failed due to reasons that seem not to be relevant anymore in the
current version 1.8.10. As the diagnostic-aggregator recipe failed
with gcc6 (cf. https://github.com/bmwcarit/meta-ros/issues/392

),
I revisited the diagnostics recipes and this commit updates them.
The current diagnostics recipes in version 1.8.10 do not fail with
gcc6, and is one step forward to build meta-ros with gcc6.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@oss.bmw-carit.de>