Integrated the new state from lendingVM into StudentMaterialSelector
LendingView now works. PDF creation throws errors. Talk to @B3nRa
integrated the return view. still get an error in pdf creation.
Opened an issue for this (see issue #252)
Merge pull request #253 from henningmu/issue#195-add_functions_to_lend_return

Issue#195 add functions to lend return