v1.8.3 - DB Bugfixes and reservations shortcut

Resolves #3 - Switched over to arrayadapters for most lists in order to
hopefully simplify database handling. Further I have implemented Loaders
in order to more easily handle configuration changes. Hopefully it will
work better. All of this will also mean lists should be faster/smoother.

Resolves #4 - Implemented shortcut to reservations website. Concluded it
would be better to use browser instead of a custom webview in order to
provide a decent experience.

Also begun on some of the commenting work....