Flop and Roll added

-Fixed height sensors
-Added secondary (plane+box) ground for height sensors
-Added flop and roll  method to applyActions

-Still missing learning for flop and roll.
Deeper ground to prevent tensegrity from accidentally falling through
Change log defaults for Tetrahedral Complex such that it uses the tuned controller
Merge branch 'master' of https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim
Copied over the serialized tetraSpine for modification
Hacked const correctness of tgStructure to add tags to the pairs
Hacky way to apply force to front segment
setup example spines for 'integration' tests
Updated restituion and friction values to those used in paper
Returning paper parameters to rods of spines
Merge branch 'master' of https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim into TetraSpineStatic
Includes crater class for compilation
Includes additional crater model
Adding Crater class to escape from
Minor edits, including prevention of some illegal final positions of model
Formatting
Merge branch 'master' of github.com:NASA-Tensegrity-Robotics-Toolkit/NTRTsim into crater
Adding ye ol' data logger to TetraSpineStatic. Added exception to ye ol data logger for lack of logs folder
Added surrounding crater for tensegrity to escape out of
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