Version 0.3

- It is now possible to favorite a teacher in the search result page.
- It is now possible to favorite a teacher in the teacher profile page.
- Added a warning when no dances are selected before pressing "Find
teacher".
- Added a warning if no internet connection is available when trying to
favorite a teacher.
- Teacher profiles have been added to the private API, making them
inaccessible if the user is not logged in.
- URLs that require login, will now prompt the user to log in, and then
redirect them to the desired content.