Removed institutionId setting because it's totally not working

Wasn't thinking straight a few hours ago...
Updated the preloadDatabase method

Added the Curriculum object preloading for the TVZ Institution object.
Minor ID changes
Updated the InstitutionFragment layout

Created a simple layout for the InstitutionFragment. On the top a image
or series of images of the institution will be visible. There's a list
of studies/courses in the curriculum section, and every one of them is a
link to download the PDF with more information about the given
study/course. At the end, there's the address of the institution.
Improved the database model

Renamed the Curriculum into Study. Created foreign key using AA between
Institution and Study.
Another database model improvement

Made a similar database model improvement like half an hour ago. Now
every Institution has a foreign key relation to a City.
Apart from that a new adapter and layout were created for the cities
spinner to allow to storing of City objects in the spinner for easy
access to the cities ID that now has to be sent to the
InstitutionFragment.