new refs
Merge branch 'master' of https://github.com/XCloudsimulation/x-cloud-perfromance-and-mobility

Conflicts:
	Performance and mobility in the x-cloud.aux
	Performance and mobility in the x-cloud.log
	Performance and mobility in the x-cloud.pdf
	Performance and mobility in the x-cloud.synctex.gz
	model_core_network.tex