moveit_core: 0.5.7-0 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `moveit_core` to `0.5.7-0`:

- distro file: `hydro/distribution.yaml`
- bloom version: `0.5.1`
- previous version for package: `0.5.6-0`

## moveit_core

```
* Constraint samplers bug fix and improvements
* fix for reverting PR #148
* Fix joint variable location segfault
* Better enforce is_valid as a flag that indicated proper configuration has been completed, added comments and warning
* Fix fcl dependency in CMakeLists.txt
* Fixed asymmetry between planning scene read and write.
* Improved error output for state conversion
* Added doxygen for RobotState::attachBody() warning of danger.
* Improved error output for state converstion
* Debug and documentation
* Added new virtual getName() function to constraint samplers
* Made getName() const with static variable
* KinematicsMetrics crashes when called with non-chain groups.
* Added prefixes to debug messages
* Documentation / comments
* Fixed asymmetry between planning scene read and write.
* Added new virtual getName function to constraint samplers for easier debugging and plugin management
* KinematicsMetrics no longer crashes when called with non-chain groups.
* Added doxygen for RobotState::attachBody() warning of danger.
* resolve full path of fcl library
  Because it seems to be common practice to ignore ${catkin_LIBRARY_DIRS}
  it's more easy to resolve the full library path here instead.
* Fix fcl dependency in CMakeLists.txt
  See http://answers.ros.org/question/80936 for details
  Interestingly collision_detection_fcl already uses the correct
  variable ${LIBFCL_LIBRARIES} although it wasn't even set before
* Contributors: Dave Coleman, Dave Hershberger, Ioan A Sucan, Sachin Chitta, sachinc, v4hn
```