use message serialization for python bindings
make pick more general
update changelog
0.5.3
add dependency on OpenCV2
update changelog
0.5.4
Better warnning info - tells you which controller failed
Merge remote-tracking branch 'upstream/hydro-devel' into hydro-devel
Merge pull request #297 from davetcoleman/hydro-devel

Better warning info - tells you which controller failed
Merge branch 'hydro-devel' into sachin-hydro