Added back-link to tutorial and updated moveit website URL.
Merge pull request #394 from ros-planning/back-link-and-url

Added back-link to tutorial and updated moveit website URL.
Merge pull request #395 from acornacorn/hydro-devel

Bugfixes
Changelogs for release.
"0.5.11"
Fixed trailing underscores in CHANGELOGs.
Changelogs for release.
"0.5.12"
move_group_interface: improve documentation