Changes

Bump libraries

- https://github.com/dzimmer/PlanarMechanics.git branch master updated to 26d9d3c588a2db9eb324ce5bb84cebbcb1856b35.
  * [https://github.com/dzimmer/PlanarMechanics/commit/26d9d3c 26d9d3c] Merge pull request #151 from tobolar/addReference
  * [https://github.com/dzimmer/PlanarMechanics/commit/64f6f15 64f6f15] Add directory containing reference variables for regression test
  * [https://github.com/dzimmer/PlanarMechanics/commit/03cbdeb 03cbdeb] Last release
  * [https://github.com/dzimmer/PlanarMechanics/commit/886abd4 886abd4] Update release date and release notes
  * [https://github.com/dzimmer/PlanarMechanics/commit/a39eb45 a39eb45] Move conversion script into proper directory