some changes to the report.py script and fixed a bug in system_id, where the observation_history was being overwritten

* Commenting out normal equation assertion in the system id method.
* The errors for training and validation are not longer stored.

Adding code to visually inspect different angle configurations to make sure it resembles the actual robot

Adding different ways to intialize the dynamic parameters. Moreover, all the settings for the system id baseline are provided through JSON

Now the system id script is independent of ROS and BLMC_EI since the urdf and mesh files are now included in the repo

Generating multiple sequences of simulated trajectories and removing the sleep calls in the simulation method

Adding a method to save simulated data in a format that is compatible with the dynamics learning code

Replacing the method show_trajectories by an equivalent implementation provided in RobotWrapper (method play). Refactoring the method load_data as well.