Documentation update is needed

[rodralez]

The following first articles:

• R. Gonzalez, J.I. Giribet, and H.D. Patiño. NaveGo: a simulation framework for low-cost integrated navigation systems, Journal of Control Engineering and Applied Informatics, vol. 17, issue 2, pp. 110-120, 2015. Download.

• R. Gonzalez, J.I. Giribet, and H.D. Patiño. An approach to benchmarking of loosely coupled low-cost navigation systems. Mathematical and Computer Modelling of Dynamical Systems, vol. 21, issue 3, pp. 272-287, 2015.

no longer expose the current formulas used by NaveGo. It could be helpful some contributor to update this document. Both documents are in Latex and will be provided to a future collaborator in charge of updating these documents.