Hide skeleton when all tasks have been completed. Closes #5
Hide skeleton when all tasks have been completed. Closes #5

The main <div> now includes a class named "skeleton" that will be
used by the loadData method to hide all the controls (photo, buttons, etc.)
from the user view when all the tasks have been completed.

Skytim/TEGEconomicTest,pgiraud/app-flickrperson,Skytim/TEGEconomicTest,SkyTruth/pybossa_tools,SkyTruth/pybossa_tools,PyBossa/app-flickrperson,PyBossa/app-flickrperson,pgiraud/app-flickrperson,PyBossa/app-flickrperson,Skytim/TEGEconomicTest,pgiraud/app-flickrperson