**Acknowledgements**

This work was financed by CONACyT (Mexican Science and Technology National Council) through the 2015 CONACyT SEP-CB (Basic Science-Public Education Ministry) project fund 258553/CONACyT/CB-2015-2101. Thanks to the Scientific Computational Laboratory at FCQ-UJED for the computational resources. Thanks to the Academic Group UJED-CA-129 for the valuable discussions.
