fixing source version.
rosdep rule: change gfortran on osx/homebrew gcc

After recent changes to the homebrew-provided gcc formula to make all binaries version-suffixed, but retain an additional suffix-less gfortran binary we can rely on this formula again and do not need to maintain our own gfortran formula.

This reverts #4607; see also 328#issuecomment-45648207.
add nao_viz
Merge pull request #4670 from vrabaud/master

add nao_viz
Merge pull request #4664 from jihoonl/patch-17

Add rospy_message_converter doc and source
Merge pull request #4669 from NikolausDemmel/patch-2

rosdep rule: change gfortran on osx/homebrew gcc
rosserial: 0.5.6-0 in 'hydro/distribution.yaml' [bloom]
Release rosserial 0.6.0 for indigo.
Merge pull request #4672 from mikepurvis/rosserial-indigo

Release rosserial 0.6.0 for indigo.
rosjava_build_tools: 0.1.34-0 in 'hydro/distribution.yaml' [bloom]
Merge pull request #4671 from mikepurvis/bloom-rosserial-0

rosserial: 0.5.6-0 in 'hydro/distribution.yaml' [bloom]
Merge pull request #4673 from stonier/bloom-rosjava_build_tools-0

rosjava_build_tools: 0.1.34-0 in 'hydro/distribution.yaml' [bloom]
graft: 0.2.0-0 in 'hydro/distribution.yaml' [bloom]
graft: 0.2.0-0 in 'indigo/distribution.yaml' [bloom]
Merge pull request #4652 from rctoris/bloom-interactive_marker_proxy-release-0

interactive_marker_proxy-release: 0.1.2-0 in 'groovy/distribution.yaml' [bloom]
Merge pull request #4653 from rctoris/bloom-interactive_marker_proxy-0

interactive_marker_proxy: 0.1.2-0 in 'indigo/distribution.yaml' [bloom]
Merge pull request #4654 from rctoris/patch-3

Moving interactive_marker_proxy to official RWT repo
Merge pull request #4674 from mikeferguson/bloom-graft-0

graft: 0.2.0-0 in 'hydro/distribution.yaml' [bloom]
Merge pull request #4675 from mikeferguson/bloom-graft-1

graft: 0.2.0-0 in 'indigo/distribution.yaml' [bloom]
control_toolbox: 1.12.1-0 in 'indigo/distribution.yaml' [bloom]