Migrated plugin to ROS Hydro
Added support to repeated eigenvalues (sometimes this resulted in glitches because computeRotation failed to return a unit quaternion)
Added icon for PoseCovariance display
Added test script for PoseCovariance display

TO DO: add odometry support
Update README.md
Update README.md
Update README.md
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Update CMakeLists.txt
Changes requested in pull request
Changes requested in pull request
Merge pull request #6 from georgebrindeiro/hydro

Port package to ROS Hydro.