add jubadump to RPM/DEB package (fix #856)
fix jubactl -X default value to linear_mixer (fix #872)
Merge pull request #879 from jubatus/pkg-jubadump

add jubadump to RPM/DEB package (fix #856)
add license file to jubadump package (refs #856)
Merge pull request #881 from jubatus/fix-872

fix jubactl -X default value to linear_mixer (fix #872)