Fixed filtering by kq and asset in both AssetAvailability resources
Improve reservations view

- Show slot id for each reservation.
- Remove button is shown aligned to the right, with btn-danger class.
Insert a new asset availability for a kq from teacheradmin interface
Enabled the removal of an asset availability from teacheradmin interface
Added a view for creating new asset reservations

reservation_create view was created. This view will be invoked from a form in
the classroom view.

Helper functions is_asset_bookable and book_asset were created as well.
Improve method handling in cancel_reservation
Create a dialog for making new reservations in classroom view

A new modal was added to classroom template to contain the new reservation form.

More information about the assets is shown in the Asset view.
A button for launching the reservation form is shown as well during the booking
period. If the user clicks the button, the modal dialog appears showing the
information about the asset and a form for selectiong the date and the time.

Once the user has clicked the confirm button, a petition is send to
reservation_create view in order to create the reservation.
Shows the asset list for a kq from teacheradmin interface