Merge pull request #171 from bulwahn/master

many recipe contributions, updates and minor clean-up
rosserial: initial commit

Main contribution by William (pull request #174) with minor
adjustments by Lukas Bulwahn.
diagnostics: initial commit
joy: initial commit
octomap-msgs: updating to 0.3.1
README: updating und tuning
gmapping: adding remote patch file
README.md: use markdown syntax for README
packagegroup-ros-world: adding new recipes
rosserial: updating to 0.5.4
ros: updating to 1.10.8
vision-opencv: updating to 1.10.10
README: adding William as contributor
packagegroup-ros-world: adding new rosserial recipes