Squashed commits:

* Added a service to set the speed slider position
* Use a more specific name for the data
  The name used is the same as defined in the RTDE interface.
* Added an explanation with valid data range to the service.
* Update comment.
* Renamed service to SetSpeedSliderFraction
  This better represents the technical background
* Use correct name of svc def file.
* Fixup

On UR robots the domain of analog in- and outputs can be configured.
The Analog.msg didn't cover this so far.

Add optional safety_controller tags to all joints in xacro macros

simplify FK equations

corrected dimensions and positions of inertias

readme: add license badge

Add description view files

As we use the joint_state_publisher, the robot_state_publisher and rviz
inside the launch files, I added them as run-dependencies.

This resolves #432

To avoid introducing another dependency, I copied the rviz configuration
from industrial_robot_client.

I'm by far not an expert in working with gazebo or inertias, but it seemed wrong to me:

- The upper arm inertia of the ur10 is not centered in the visual arm segment
- CoM in the wrist links don't sit inside the correct links. E.g. wrist1 has its CoM inside the end of the forearm for all robots.
- Because of the second point the inertia's geometry of wrist3 is matching wrist2 instead of the actual moving part of wrist3.
- Wrist dimensions of ur5 were completely off.
- On the ur5e the arm inertias weren't centered in the visuals.

* Load the JointGroupPositionController so jog commands can be sent

* Load new controllers for UR5/UR10, too

* Add other controllers in launch file

* Add JointGroupPositionController to UR e-series

Squashed commits:

* update installation instructions to be consistent with the ROS wiki
* recommend the use of catkin_make instead of catkin build
* readme: clarify installation instructions further.
* readme: don't point users to kforge any more.
* readme: Kinetic is a name.

* Add Migual Prada as maintainer.

* Sort maintainers alphabetically.

* Fix maintainers and author listing in all e-series pkgs.

Was missing from #380.

* add new metapackage, first step to rename the repo

* meta: use package format 2.

* meta: depend on all UR packages.

* Make old metapkg depend on new one.

Transitional period only.