Scheduled AP changes and simulation times

Made a simple function to change the SSID of the mobile node at the time
specified. The time to make the changes is done taking into account the speed
of the mobile node. the ending of the simulation is calculated using similar
formulas.
fixed conflicts
Merge branch 'master' of https://github.com/nacarino/ICC into nacarino-master

Conflicts:
	scenarios/icc-scenario.cc
2nd fix
Merge branch 'nacarino-master'

Conflicts:
	scenarios/icc-scenario.cc