Enabled nuget package restore on build, renamed PandocTaskVM to reflect other viewmodels' naming convention
Started to implement xml based data storage
Revert "Started to implement xml based data storage"

This reverts commit 0f68f1ac16c19988b6d66b08622f8bade62f62d9.
Added missing nuget.exe for real nuget restore capability
Added support for .pdf output files